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new CPU, new OS?

if i change the CPU but not the mobo, do i have to clean install the OS?

i really have no idea, never did this before

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Maybe enter the key again... Should be fine, though.

Intel Core i7-6700K | Corsair H105 | Asus Z170I PRO GAMING | G.Skill TridentZ Series 16GB | 950 PRO 512GB M.2

 

Asus GeForce GTX 980 Ti 6GB STRIX OC | BitFenix Prodigy (Black/Red) | XFX PRO Black Edition 850W

 

 

My BuildPCPartPicker | CoC

 

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you dont but if you want to be safe i would

AMD FX-8350|8GB DDR3|GTX750TI|2TB HDD|CX-430 PSU|

 

 

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Nope.

 

G3258 V 860k (Spoiler: G3258 wins)

 

 

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i7-4790K | MSI R9 390x | Cryorig H5 | MSI Z97 Gaming 7 Motherboard | G.Skill Sniper 8gbx2 1600mhz DDR3 | Corsair 300R | WD Green 2TB 2.5" 5400RPM drive | <p>Corsair RM750 | Logitech G602 | Corsair K95 RGB | Logitech Z313

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Nah its safe! :D

Zen-III-X12-5900X (Gaming PC)

Spoiler

Case: Medion Micro-ATX Case / Case Fan Front: SUNON MagLev PF70251VX-Q000-S99 70mm / Case Fan Rear: Fanner Tech(Shen Zhen)Co.,LTD. 80mm (Purple) / Controller: Sony Dualshock 4 Wireless (DS4Windows) / Cooler: AMD Near-silent 125w Thermal Solution / CPU: AMD Ryzen 5 3600, 6-cores, 12-threads, 4.2/4.2GHz, 35,3MB cache (T.S.M.C. 7nm FinFET) / CPU: AMD Ryzen 9 5900X(ECO mode), 12-cores, 24-threads, 4.5/4.8GHz, 70.5MB cache (T.S.M.C. 7nm FinFET) / Display: HP 24" L2445w (64Hz OC) 1920x1200 / GPU: MSI GeForce GTX 970 4GD5 OC "Afterburner" @1450MHz (T.S.M.C. 28nm) / GPU: ASUS Radeon RX 6600 XT DUAL OC RDNA2 32CUs @2.6GHz 10.6 TFLOPS (T.S.M.C. 7nm FinFET) / Keyboard: HP KB-0316 PS/2 (Nordic) / Motherboard: ASRock B450M Pro4, Socket-AM4 / Mouse: Razer Abyssus 2014 / PCI-E: ASRock USB 3.1/A+C (PCI Express x4) / PSU: EVGA SuperNOVA G2, 550W / RAM A2 & B2: DDR4-3600MHz CL16-18-8-19-37-1T "SK Hynix 8Gbit CJR" (2x16GB) / Operating System: Windows 10 Home / Sound 1: Zombee Z500 / Sound 2: Logitech Stereo Speakers S-150 / Storage 1 & 2: Samsung 850 EVO 500GB SSD / Storage 3: Western Digital My Passport 2.5" 2TB HDD / Storage 4: Western Digital Elements Desktop 2TB HDD / Storage 5: Kingston A2000 1TB M.2 NVME SSD / Wi-fi & Bluetooth: ASUS PCE-AC55BT Wireless Adapter (Intel)

 Lake-V-X6-10600 (Gaming PC)

R23 score MC: 9190pts | R23 score SC: 1302pts

R20 score MC: 3529cb | R20 score SC: 506cb

Spoiler

Case: Cooler Master HAF XB Evo Black / Case Fan(s) Front: Noctua NF-A14 ULN 140mm Premium Fans / Case Fan(s) Rear: Corsair Air Series AF120 Quiet Edition (red) / Case Fan(s) Side: Noctua NF-A6x25 FLX 60mm Premium Fan / Controller: Sony Dualshock 4 Wireless (DS4Windows) / Cooler: Cooler Master Hyper 212 Evo / CPU: Intel Core i5-10600(ASUS Performance Enhancement), 6-cores, 12-threads, 4.4/4.8GHz, 13,7MB cache (Intel 14nm++ FinFET) / Display: ASUS 24" LED VN247H (67Hz OC) 1920x1080p / GPU: Gigabyte Radeon RX Vega 56 Gaming OC @1.5GHz 10.54 TFLOPS (Samsung 14nm FinFET) / Keyboard: Logitech Desktop K120 (Nordic) / Motherboard: ASUS PRIME B460 PLUS, Socket-LGA1200 / Mouse: Razer Abyssus 2014 / PCI-E: ASRock USB 3.1/A+C (PCI Express x4) / PSU: EVGA SuperNOVA G2, 850W / RAM A1, A2, B1 & B2: DDR4-2666MHz CL13-15-15-15-35-1T "Samsung 8Gbit C-Die" (4x8GB) / Operating System: Windows 10 Home / Sound: Zombee Z300 / Storage 1 & 2: Samsung 850 EVO 500GB SSD / Storage 3: Seagate® Barracuda 2TB HDD / Storage 4: Seagate® Desktop 2TB SSHD / Storage 5: Crucial P1 1000GB M.2 SSD/ Storage 6: Western Digital WD7500BPKX 2.5" HDD / Wi-fi: TP-Link TL-WN851N 11n Wireless Adapter (Qualcomm Atheros)

Vishera-X8-9370 | R20 score MC: 1476cb

Spoiler

Case: Cooler Master HAF XB Evo Black / Case Fan(s) Front: Noctua NF-A14 ULN 140mm Premium Fans / Case Fan(s) Rear: Corsair Air Series AF120 Quiet Edition (red) / Case Fan(s) Side: Noctua NF-A6x25 FLX 60mm Premium Fan / Case Fan VRM: SUNON MagLev KDE1209PTV3 92mm / Controller: Sony Dualshock 4 Wireless (DS4Windows) / Cooler: Cooler Master Hyper 212 Evo / CPU: AMD FX-8370 (Base: @4.4GHz | Turbo: @4.7GHz) Black Edition Eight-Core (Global Foundries 32nm) / Display: ASUS 24" LED VN247H (67Hz OC) 1920x1080p / GPU: MSI GeForce GTX 970 4GD5 OC "Afterburner" @1450MHz (T.S.M.C. 28nm) / GPU: Gigabyte Radeon RX Vega 56 Gaming OC @1501MHz (Samsung 14nm FinFET) / Keyboard: Logitech Desktop K120 (Nordic) / Motherboard: MSI 970 GAMING, Socket-AM3+ / Mouse: Razer Abyssus 2014 / PCI-E: ASRock USB 3.1/A+C (PCI Express x4) / PSU: EVGA SuperNOVA G2, 850W PSU / RAM 1, 2, 3 & 4: Corsair Vengeance DDR3-1866MHz CL8-10-10-28-37-2T (4x4GB) 16.38GB / Operating System 1: Windows 10 Home / Sound: Zombee Z300 / Storage 1: Samsung 850 EVO 500GB SSD (x2) / Storage 2: Seagate® Barracuda 2TB HDD / Storage 3: Seagate® Desktop 2TB SSHD / Wi-fi: TP-Link TL-WN951N 11n Wireless Adapter

Godavari-X4-880K | R20 score MC: 810cb

Spoiler

Case: Medion Micro-ATX Case / Case Fan Front: SUNON MagLev PF70251VX-Q000-S99 70mm / Case Fan Rear: Fanner Tech(Shen Zhen)Co.,LTD. 80mm (Purple) / Controller: Sony Dualshock 4 Wireless (DS4Windows) / Cooler: AMD Near-silent 95w Thermal Solution / Cooler: AMD Near-silent 125w Thermal Solution / CPU: AMD Athlon X4 860K Black Edition Elite Quad-Core (T.S.M.C. 28nm) / CPU: AMD Athlon X4 880K Black Edition Elite Quad-Core (T.S.M.C. 28nm) / Display: HP 19" Flat Panel L1940 (75Hz) 1280x1024 / GPU: EVGA GeForce GTX 960 SuperSC 2GB (T.S.M.C. 28nm) / GPU: MSI GeForce GTX 970 4GD5 OC "Afterburner" @1450MHz (T.S.M.C. 28nm) / Keyboard: HP KB-0316 PS/2 (Nordic) / Motherboard: MSI A78M-E45 V2, Socket-FM2+ / Mouse: Razer Abyssus 2014 / PCI-E: ASRock USB 3.1/A+C (PCI Express x4) / PSU: EVGA SuperNOVA G2, 550W PSU / RAM 1, 2, 3 & 4: SK hynix DDR3-1866MHz CL9-10-11-27-40 (4x4GB) 16.38GB / Operating System 1: Ubuntu Gnome 16.04 LTS (Xenial Xerus) / Operating System 2: Windows 10 Home / Sound 1: Zombee Z500 / Sound 2: Logitech Stereo Speakers S-150 / Storage 1: Samsung 850 EVO 500GB SSD (x2) / Storage 2: Western Digital My Passport 2.5" 2TB HDD / Storage 3: Western Digital Elements Desktop 2TB HDD / Wi-fi: TP-Link TL-WN851N 11n Wireless Adapter

Acer Aspire 7738G custom (changed CPU, GPU & Storage)
Spoiler

CPU: Intel Core 2 Duo P8600, 2-cores, 2-threads, 2.4GHz, 3MB cache (Intel 45nm) / GPU: ATi Radeon HD 4570 515MB DDR2 (T.S.M.C. 55nm) / RAM: DDR2-1066MHz CL7-7-7-20-1T (2x2GB) / Operating System: Windows 10 Home / Storage: Crucial BX500 480GB 3D NAND SATA 2.5" SSD

Complete portable device SoC history:

Spoiler
Apple A4 - Apple iPod touch (4th generation)
Apple A5 - Apple iPod touch (5th generation)
Apple A9 - Apple iPhone 6s Plus
HiSilicon Kirin 810 (T.S.M.C. 7nm) - Huawei P40 Lite / Huawei nova 7i
Mediatek MT2601 (T.S.M.C 28nm) - TicWatch E
Mediatek MT6580 (T.S.M.C 28nm) - TECNO Spark 2 (1GB RAM)
Mediatek MT6592M (T.S.M.C 28nm) - my|phone my32 (orange)
Mediatek MT6592M (T.S.M.C 28nm) - my|phone my32 (yellow)
Mediatek MT6735 (T.S.M.C 28nm) - HMD Nokia 3 Dual SIM
Mediatek MT6737 (T.S.M.C 28nm) - Cherry Mobile Flare S6
Mediatek MT6739 (T.S.M.C 28nm) - my|phone myX8 (blue)
Mediatek MT6739 (T.S.M.C 28nm) - my|phone myX8 (gold)
Mediatek MT6750 (T.S.M.C 28nm) - honor 6C Pro / honor V9 Play
Mediatek MT6765 (T.S.M.C 12nm) - TECNO Pouvoir 3 Plus
Mediatek MT6797D (T.S.M.C 20nm) - my|phone Brown Tab 1
Qualcomm MSM8926 (T.S.M.C. 28nm) - Microsoft Lumia 640 LTE
Qualcomm MSM8974AA (T.S.M.C. 28nm) - Blackberry Passport
Qualcomm SDM710 (Samsung 10nm) - Oppo Realme 3 Pro

 

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Nope.

 

 

Nah its safe! :D

so i just put the new one in and that's it?

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if i change the CPU but not the mobo, do i have to clean install the OS?

i really have no idea, never did this before

nope

"Sulit" (adj.) something that is worth it

i7 8700K 4.8Ghz delidded / Corsair H100i V2 / Asus Strix Z370-F / G.Skill Trident Z RGB 16GB 3200 / EVGA GTX 1080Ti FTW3 / ASUS ROG SWIFT PG279Q

Samsung 850 EVO 500GB & 250GB - Crucial MX300 M.2 525GB / Fractal Design Define S / Corsair K70 MX Reds / Logitech G502 / Beyerdynamic DT770 250Ohm

SMSL SD793II AMP/DAC - Schiit Magni 3 / PCPP

Old Rig

i5 2500k 4.5Ghz | Gigabyte Z68XP-UD3P | Zotac GTX 980 AMP! Extreme | Crucial Ballistix Tactical 16GB 1866MHz

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so i just put the new one in and that's it?

 

Yep. If it says Windows is no longer activated, just re-enter the key through Settings.

Intel Core i7-6700K | Corsair H105 | Asus Z170I PRO GAMING | G.Skill TridentZ Series 16GB | 950 PRO 512GB M.2

 

Asus GeForce GTX 980 Ti 6GB STRIX OC | BitFenix Prodigy (Black/Red) | XFX PRO Black Edition 850W

 

 

My BuildPCPartPicker | CoC

 

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so i just put the new one in and that's it?

Yup but in worst case scenario you may have to press the reset CMOS button but try without first! :D

Zen-III-X12-5900X (Gaming PC)

Spoiler

Case: Medion Micro-ATX Case / Case Fan Front: SUNON MagLev PF70251VX-Q000-S99 70mm / Case Fan Rear: Fanner Tech(Shen Zhen)Co.,LTD. 80mm (Purple) / Controller: Sony Dualshock 4 Wireless (DS4Windows) / Cooler: AMD Near-silent 125w Thermal Solution / CPU: AMD Ryzen 5 3600, 6-cores, 12-threads, 4.2/4.2GHz, 35,3MB cache (T.S.M.C. 7nm FinFET) / CPU: AMD Ryzen 9 5900X(ECO mode), 12-cores, 24-threads, 4.5/4.8GHz, 70.5MB cache (T.S.M.C. 7nm FinFET) / Display: HP 24" L2445w (64Hz OC) 1920x1200 / GPU: MSI GeForce GTX 970 4GD5 OC "Afterburner" @1450MHz (T.S.M.C. 28nm) / GPU: ASUS Radeon RX 6600 XT DUAL OC RDNA2 32CUs @2.6GHz 10.6 TFLOPS (T.S.M.C. 7nm FinFET) / Keyboard: HP KB-0316 PS/2 (Nordic) / Motherboard: ASRock B450M Pro4, Socket-AM4 / Mouse: Razer Abyssus 2014 / PCI-E: ASRock USB 3.1/A+C (PCI Express x4) / PSU: EVGA SuperNOVA G2, 550W / RAM A2 & B2: DDR4-3600MHz CL16-18-8-19-37-1T "SK Hynix 8Gbit CJR" (2x16GB) / Operating System: Windows 10 Home / Sound 1: Zombee Z500 / Sound 2: Logitech Stereo Speakers S-150 / Storage 1 & 2: Samsung 850 EVO 500GB SSD / Storage 3: Western Digital My Passport 2.5" 2TB HDD / Storage 4: Western Digital Elements Desktop 2TB HDD / Storage 5: Kingston A2000 1TB M.2 NVME SSD / Wi-fi & Bluetooth: ASUS PCE-AC55BT Wireless Adapter (Intel)

 Lake-V-X6-10600 (Gaming PC)

R23 score MC: 9190pts | R23 score SC: 1302pts

R20 score MC: 3529cb | R20 score SC: 506cb

Spoiler

Case: Cooler Master HAF XB Evo Black / Case Fan(s) Front: Noctua NF-A14 ULN 140mm Premium Fans / Case Fan(s) Rear: Corsair Air Series AF120 Quiet Edition (red) / Case Fan(s) Side: Noctua NF-A6x25 FLX 60mm Premium Fan / Controller: Sony Dualshock 4 Wireless (DS4Windows) / Cooler: Cooler Master Hyper 212 Evo / CPU: Intel Core i5-10600(ASUS Performance Enhancement), 6-cores, 12-threads, 4.4/4.8GHz, 13,7MB cache (Intel 14nm++ FinFET) / Display: ASUS 24" LED VN247H (67Hz OC) 1920x1080p / GPU: Gigabyte Radeon RX Vega 56 Gaming OC @1.5GHz 10.54 TFLOPS (Samsung 14nm FinFET) / Keyboard: Logitech Desktop K120 (Nordic) / Motherboard: ASUS PRIME B460 PLUS, Socket-LGA1200 / Mouse: Razer Abyssus 2014 / PCI-E: ASRock USB 3.1/A+C (PCI Express x4) / PSU: EVGA SuperNOVA G2, 850W / RAM A1, A2, B1 & B2: DDR4-2666MHz CL13-15-15-15-35-1T "Samsung 8Gbit C-Die" (4x8GB) / Operating System: Windows 10 Home / Sound: Zombee Z300 / Storage 1 & 2: Samsung 850 EVO 500GB SSD / Storage 3: Seagate® Barracuda 2TB HDD / Storage 4: Seagate® Desktop 2TB SSHD / Storage 5: Crucial P1 1000GB M.2 SSD/ Storage 6: Western Digital WD7500BPKX 2.5" HDD / Wi-fi: TP-Link TL-WN851N 11n Wireless Adapter (Qualcomm Atheros)

Vishera-X8-9370 | R20 score MC: 1476cb

Spoiler

Case: Cooler Master HAF XB Evo Black / Case Fan(s) Front: Noctua NF-A14 ULN 140mm Premium Fans / Case Fan(s) Rear: Corsair Air Series AF120 Quiet Edition (red) / Case Fan(s) Side: Noctua NF-A6x25 FLX 60mm Premium Fan / Case Fan VRM: SUNON MagLev KDE1209PTV3 92mm / Controller: Sony Dualshock 4 Wireless (DS4Windows) / Cooler: Cooler Master Hyper 212 Evo / CPU: AMD FX-8370 (Base: @4.4GHz | Turbo: @4.7GHz) Black Edition Eight-Core (Global Foundries 32nm) / Display: ASUS 24" LED VN247H (67Hz OC) 1920x1080p / GPU: MSI GeForce GTX 970 4GD5 OC "Afterburner" @1450MHz (T.S.M.C. 28nm) / GPU: Gigabyte Radeon RX Vega 56 Gaming OC @1501MHz (Samsung 14nm FinFET) / Keyboard: Logitech Desktop K120 (Nordic) / Motherboard: MSI 970 GAMING, Socket-AM3+ / Mouse: Razer Abyssus 2014 / PCI-E: ASRock USB 3.1/A+C (PCI Express x4) / PSU: EVGA SuperNOVA G2, 850W PSU / RAM 1, 2, 3 & 4: Corsair Vengeance DDR3-1866MHz CL8-10-10-28-37-2T (4x4GB) 16.38GB / Operating System 1: Windows 10 Home / Sound: Zombee Z300 / Storage 1: Samsung 850 EVO 500GB SSD (x2) / Storage 2: Seagate® Barracuda 2TB HDD / Storage 3: Seagate® Desktop 2TB SSHD / Wi-fi: TP-Link TL-WN951N 11n Wireless Adapter

Godavari-X4-880K | R20 score MC: 810cb

Spoiler

Case: Medion Micro-ATX Case / Case Fan Front: SUNON MagLev PF70251VX-Q000-S99 70mm / Case Fan Rear: Fanner Tech(Shen Zhen)Co.,LTD. 80mm (Purple) / Controller: Sony Dualshock 4 Wireless (DS4Windows) / Cooler: AMD Near-silent 95w Thermal Solution / Cooler: AMD Near-silent 125w Thermal Solution / CPU: AMD Athlon X4 860K Black Edition Elite Quad-Core (T.S.M.C. 28nm) / CPU: AMD Athlon X4 880K Black Edition Elite Quad-Core (T.S.M.C. 28nm) / Display: HP 19" Flat Panel L1940 (75Hz) 1280x1024 / GPU: EVGA GeForce GTX 960 SuperSC 2GB (T.S.M.C. 28nm) / GPU: MSI GeForce GTX 970 4GD5 OC "Afterburner" @1450MHz (T.S.M.C. 28nm) / Keyboard: HP KB-0316 PS/2 (Nordic) / Motherboard: MSI A78M-E45 V2, Socket-FM2+ / Mouse: Razer Abyssus 2014 / PCI-E: ASRock USB 3.1/A+C (PCI Express x4) / PSU: EVGA SuperNOVA G2, 550W PSU / RAM 1, 2, 3 & 4: SK hynix DDR3-1866MHz CL9-10-11-27-40 (4x4GB) 16.38GB / Operating System 1: Ubuntu Gnome 16.04 LTS (Xenial Xerus) / Operating System 2: Windows 10 Home / Sound 1: Zombee Z500 / Sound 2: Logitech Stereo Speakers S-150 / Storage 1: Samsung 850 EVO 500GB SSD (x2) / Storage 2: Western Digital My Passport 2.5" 2TB HDD / Storage 3: Western Digital Elements Desktop 2TB HDD / Wi-fi: TP-Link TL-WN851N 11n Wireless Adapter

Acer Aspire 7738G custom (changed CPU, GPU & Storage)
Spoiler

CPU: Intel Core 2 Duo P8600, 2-cores, 2-threads, 2.4GHz, 3MB cache (Intel 45nm) / GPU: ATi Radeon HD 4570 515MB DDR2 (T.S.M.C. 55nm) / RAM: DDR2-1066MHz CL7-7-7-20-1T (2x2GB) / Operating System: Windows 10 Home / Storage: Crucial BX500 480GB 3D NAND SATA 2.5" SSD

Complete portable device SoC history:

Spoiler
Apple A4 - Apple iPod touch (4th generation)
Apple A5 - Apple iPod touch (5th generation)
Apple A9 - Apple iPhone 6s Plus
HiSilicon Kirin 810 (T.S.M.C. 7nm) - Huawei P40 Lite / Huawei nova 7i
Mediatek MT2601 (T.S.M.C 28nm) - TicWatch E
Mediatek MT6580 (T.S.M.C 28nm) - TECNO Spark 2 (1GB RAM)
Mediatek MT6592M (T.S.M.C 28nm) - my|phone my32 (orange)
Mediatek MT6592M (T.S.M.C 28nm) - my|phone my32 (yellow)
Mediatek MT6735 (T.S.M.C 28nm) - HMD Nokia 3 Dual SIM
Mediatek MT6737 (T.S.M.C 28nm) - Cherry Mobile Flare S6
Mediatek MT6739 (T.S.M.C 28nm) - my|phone myX8 (blue)
Mediatek MT6739 (T.S.M.C 28nm) - my|phone myX8 (gold)
Mediatek MT6750 (T.S.M.C 28nm) - honor 6C Pro / honor V9 Play
Mediatek MT6765 (T.S.M.C 12nm) - TECNO Pouvoir 3 Plus
Mediatek MT6797D (T.S.M.C 20nm) - my|phone Brown Tab 1
Qualcomm MSM8926 (T.S.M.C. 28nm) - Microsoft Lumia 640 LTE
Qualcomm MSM8974AA (T.S.M.C. 28nm) - Blackberry Passport
Qualcomm SDM710 (Samsung 10nm) - Oppo Realme 3 Pro

 

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you dont but if you want to be safe i would

 

Safe from what exactly? What could go so wrong that would make re-installing Windows convenient in any way? All he would do is just start over for no reason at all.

This is not the "it's always safe to backup" thing, he will actually be losing everything if he wants to be "safe" like you suggest.

 

To OP, no it's fine. It might ask for a serial, but well if you clean installed it would do the same. You might need to re-install your chipset drivers in some rare cases, but not likely.

 
~ Specs bellow ~
 
 
Windows 10 Pro 64-bit [UEFI]
CPU: Intel i7-5820k Haswell-E @ 4.5-4.7Ghz (1.366-1.431V) | CPU COOLER: Corsair H110 280mm AIO w/ 2x Noctua NF-A14 IPPC-2000 IP67 | RAM: G.Skill Ripjaws 4 32Gb (8x4Gb) DDR4 @ 2666mhz CL15 | MOBO: MSI X99S Gaming 7 ATX | GPU: MSI GTX 1080 Gaming (flashed "X") @ 2138-2151Mhz (locked 1.093V) | PSU: Corsair HX850i 850W 80+ Platinum | SSD's: Samsung Pro 950 256Gb & Samsung Evo 850 500Gb | HDD: WD Black Series 6Tb + 3Tb | AUDIO: Realtek ALC1150 HD Audio | CASE: NZXT Phantom 530 | MONITOR: LG 34UC79G 34" 2560x1080p @144hz & BenQ XL2411Z 24" 1080p @144hz | SPEAKERS: Logitech Z-5450 Digital 5.1 Speaker System | HEADSET: Sennheiser GSP 350 | KEYBOARD: Corsair Strafe MX Cherry Red | MOUSE: Razer Deathadder Chroma | UPS: PowerWalker VI 2000 LCD
 
Mac Pro 2,1 (flashed) OS X 10.11.6 El Capitan 64-bit (NAS, Plex, HTTP Server, Game Servers) [R.I.P]
CPUs: 2x Intel Xeon X5365 @ 3.3Ghz (FSB OC) | RAM: OWC 16Gb (8x2Gb) ECC-FB DDR2 @ 1333mhz | GPU: AMD HD5870 (flashed) | HDDs: WD Black Series 3Tb, 2x WD Black Series 1Tb, WD Blue 2Tb | UPS: Fortron EP1000
 
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Personally done it many times. Ignore those saying to reinstall or whatever, it's absolutely fine. Never been asked for key except on servers either.

CPU: i7 4790k 4.6GHz @ 1.19v     GPU: Gigabyte G1 GTX970 1590Core     RAM:16GB Corsair Vengeance Pro    SSD: Samsung 850 Evo Raid 0

Cooler: Corsair H110i GT             Case: NZXT H440 Black Windowed          1TB WDD Blue, NZXT Hue+, MSI Z97S SLI Krait, Asus VX347H x2

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Sometimes when changing motherboard Windows decides that you need to reenter the key again or uninstall some drivers that can cause conflicts with new ones, but swapping CPU is just plug&play.

CPU-delided i5-4670k@4.6Ghz 1.42v R.I.P (2013-2015) MOBO-Asus Maximus VI Gene GPU-Gigabyte GTX 970 G1 Gaming@1582Mhz core/3744Mhz memory COOLING-Corsair H60 RAM-1x8Gb Crucial ballistix tactical tracer@2133Mhz 11-12-12-26  DRIVES-Kingston V300 60Gb, OCZ trion 100 120Gb, WD Red 1Tb
2nd  fastest i5 4670k in GPUPI for CPU - 100M
 
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