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3 minutes ago, Tan3l6 said:

They will work at 2800Mhz

Or give you BSOD

There is more than speed to account for.
I strongly suggest you don't mix two different RAM of a system unless the have identical CAS latency and speed.

 

Flip those older module on the used market to finance some additional sticks.

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if they are the same company/model of ram its generally ok. i have a crucial ballistix sport 3000mhz and a crucial ballistix sport 3200mhz and i actually manage to get both of them to run at 3200mhz. but ofc i got lucky and theres a good chance in your case they might all just run at 2800mhz

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9 minutes ago, Quickstrike said:

Or give you BSOD

There is more than speed to account for.
I strongly suggest you don't mix two different RAM of a system unless the have identical CAS latency and speed.

 

Flip those older module on the used market to finance some additional sticks.

I have been building my own PC and mixing RAMs since 2001 ... never seen a BSOD because ram kits incompatibility. Honestly.

Pax vobiscum

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Just now, Tan3l6 said:

I have been building and mixing RAMs since 2001 ... never seen a BSOD because ram kits incompatibility. Honestly.

I have... in 2001 Battlefield Vietnam didn't like it and the slower module crashed my rig.

It was under early windows XP. 

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CPU Ryzen 5900X - Motherboard Asus ROG STRIX X570-E - RAM 16GB of G.SKILL NEON 3600 -
GPU EVGA RTX 3080 XC3 - Case Mastercase H500p mesh - PSU Seasonic Focus Gx-850 -
Corsair MP600 NVME 1 Tb, Samsung 960 PRO 500 Gb & 2 Seagate Baracuda 7200 RPM 2TB in stripe -
Display two VG27AQ 2K monitor - Cooling Corsair H150 Pro - 

Keyboard G-910 W/ Romer G tactile - Mouse G 502 Hero (wired) -
Sound Logitech X-530 and Razer Tiamat headphones

Operating System Windows 10

 

 

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You can usually get all of the RAM to run at the slower RAMs speed. If you're lucky you could overclock the slower RAM to match the faster RAM but that comes with challenges of its own. It's generally easier to clock the faster RAM down to match the slower RAM then tighten the RAM timing appropriately to get everything you can out of the mixed pair.

 

But in short, yes you can mix them. It may not work first try out of the box though and D.O.C.P./X.M.P. might cause instability.

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There are reasons for instability that are somewhat separate from speeds/timings. Loading up the effective total rank per channel tends to reduce the speed it will support. I don't mix kits if I can help it, but on the occasions I do, I haven't experienced any problems. On the flip side, I have many times encountered kits and mobos that just wont play well together. Either are fine when in other systems. Some combos just don't work. 

Gaming system: R7 7800X3D, Asus ROG Strix B650E-F Gaming Wifi, Thermalright Phantom Spirit 120 SE ARGB, Corsair Vengeance 2x 32GB 6000C30, MSI Ventus 3x OC RTX 5070 Ti, MSI MPG A850G, Fractal Design North, Samsung 990 Pro 2TB, Alienware AW3225QF (32" 240 Hz OLED)
Productivity system: i9-7980XE, Asus X299 TUF mark 2, Noctua D15, 64GB ram (mixed), RTX 4070 FE, NZXT E850, GameMax Abyss, Samsung 980 Pro 2TB, iiyama ProLite XU2793QSU-B6 (27" 1440p 100 Hz)
Gaming laptop: Lenovo Legion 5, 5800H, RTX 3070, Kingston DDR4 3200C22 2x16GB 2Rx8, Kingston Fury Renegade 1TB + Crucial P1 1TB SSD, 165 Hz IPS 1080p G-Sync Compatible

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