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Undervolt OMG support

Hey, I’m literally new in all this. I wanted to know if it’s safe to undervolt my laptop’s i7-8750H and wanted to know the cautions and warnings b4 I do anything I’d regret

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3 minutes ago, Draggy1599 said:

Hey, I’m literally new in all this. I wanted to know if it’s safe to undervolt my laptop’s i7-8750H and wanted to know the cautions and warnings b4 I do anything I’d regret

Undervolting can't really do any damage. Sure it might crash your laptop but a simple boot back to bios would fix that. I'm not a pro with any of this, but you might run into issues with undervolting being blocked in your bios due to Plundervolt exploits, but I'm not entirely sure how those restrictions work.

 

Also keep in mind while you might be stable with better temps, you will lose performance.

 

For example I went from a stock 3800x in testing to a 1.2V undervolt, and my temps were amazing (56C max), but my R20 score dropped by 300

Gaming Build:

CPU: Ryzen 7 3800x   |  GPU: Asus ROG STRIX 2080 SUPER Advanced (2115Mhz Core | 9251Mhz Memory) |  Motherboard: Asus X570 TUF GAMING-PLUS  |  RAM: G.Skill Ripjaws DDR4 3600MHz 16GB  |  PSU: Corsair RM850x  |  Storage: 1TB ADATA XPG SX8200 Pro, 250GB Samsung 840 Evo, 500GB Samsung 840 Evo  |  Cooler: Corsair H115i Pro XT  |  Case: Lian Li PC-O11

 

Peripherals:

Monitor: LG 34GK950F  |  Sound: Sennheiser HD 598  |  Mic: Blue Yeti  |  Keyboard: Corsair K95 RGB Platinum  |  Mouse: Logitech G502

 

Laptop:

Asus ROG Zephryus G15

Ryzen 7 4800HS, GTX1660Ti, 16GB DDR4 3200Mhz, 512GB nVME, 144hz

 

NAS:

QNAP TS-451

6TB Ironwolf Pro

 

 

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15 minutes ago, Statik said:

-snip-

 

Also keep in mind while you might be stable with better temps, you will lose performance.

 

For example I went from a stock 3800x in testing to a 1.2V undervolt, and my temps were amazing (56C max), but my R20 score dropped by 300

I'm not sure I've seen anyone talk about Intel using clock stretching.  What you see with Ryzen 3000 clock stretching is reduced clock speeds during periods of insufficient power to maintain stability.  

AMD Ryzen 3900X  |  Fractal Design S36 360 AIO w/6 Corsair SP120L fans  |  Asus Crosshair VII WiFi X470  |  G.SKILL TridentZ 3600CL15 2x8GB @ 3800MHz 14-16-14-14-34  |  EVGA 1070 Ti SC GAMING ACX 3.0 Black w/NZXT Kraken G12 Cooler  |  Samsung 970 EVO M.2 NVMe 500GB - Boot Drive  |  Samsung 850 EVO SSD 1TB - Game Drive  |  Seagate 1TB HDD - Media Drive  |  EVGA 650 G3 PSU | Thermaltake Core P3 Case 

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1 hour ago, nick name said:

I'm not sure I've seen anyone talk about Intel using clock stretching.  What you see with Ryzen 3000 clock stretching is reduced clock speeds during periods of insufficient power to maintain stability.  

I'm going to be totally, honest, I just googled clock stretching and felt like this

Maths.gif

Gaming Build:

CPU: Ryzen 7 3800x   |  GPU: Asus ROG STRIX 2080 SUPER Advanced (2115Mhz Core | 9251Mhz Memory) |  Motherboard: Asus X570 TUF GAMING-PLUS  |  RAM: G.Skill Ripjaws DDR4 3600MHz 16GB  |  PSU: Corsair RM850x  |  Storage: 1TB ADATA XPG SX8200 Pro, 250GB Samsung 840 Evo, 500GB Samsung 840 Evo  |  Cooler: Corsair H115i Pro XT  |  Case: Lian Li PC-O11

 

Peripherals:

Monitor: LG 34GK950F  |  Sound: Sennheiser HD 598  |  Mic: Blue Yeti  |  Keyboard: Corsair K95 RGB Platinum  |  Mouse: Logitech G502

 

Laptop:

Asus ROG Zephryus G15

Ryzen 7 4800HS, GTX1660Ti, 16GB DDR4 3200Mhz, 512GB nVME, 144hz

 

NAS:

QNAP TS-451

6TB Ironwolf Pro

 

 

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57 minutes ago, Statik said:

I'm going to be totally, honest, I just googled clock stretching and felt like this

Maths.gif

Lol.  Well at least you have a better understanding of why your CPU loses performance running lower voltages.  

 

I use an offset of -0.5V -- anything beyond that causes the worst core in my CPU to lose performance.  It's not much, but that's where it starts. 

 

If you set a low fixed voltage then any higher speeds are going to "run", but at a reduced level.  You can see that happen if you use HWiNFO and watch "effective clock speeds" and compare that to the multiplier during a Cinbench 20 run.  

AMD Ryzen 3900X  |  Fractal Design S36 360 AIO w/6 Corsair SP120L fans  |  Asus Crosshair VII WiFi X470  |  G.SKILL TridentZ 3600CL15 2x8GB @ 3800MHz 14-16-14-14-34  |  EVGA 1070 Ti SC GAMING ACX 3.0 Black w/NZXT Kraken G12 Cooler  |  Samsung 970 EVO M.2 NVMe 500GB - Boot Drive  |  Samsung 850 EVO SSD 1TB - Game Drive  |  Seagate 1TB HDD - Media Drive  |  EVGA 650 G3 PSU | Thermaltake Core P3 Case 

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14 minutes ago, nick name said:

Lol.  Well at least you have a better understanding of why your CPU loses performance running lower voltages.  

 

I use an offset of -0.5V -- anything beyond that causes the worst core in my CPU to lose performance.  It's not much, but that's where it starts. 

 

If you set a low fixed voltage then any higher speeds are going to "run", but at a reduced level.  You can see that happen if you use HWiNFO and watch "effective clock speeds" and compare that to the multiplier during a Cinbench 20 run.  

That's interesting. I might have to look into that. I've always liked the idea of undervolting my 3800x to get it to run a little cooler, but I just didn't know where to start.

 

I just remember running it stock speeds at 1.2V and seeing that baby not even break 60C, and I was diggin' it.

Gaming Build:

CPU: Ryzen 7 3800x   |  GPU: Asus ROG STRIX 2080 SUPER Advanced (2115Mhz Core | 9251Mhz Memory) |  Motherboard: Asus X570 TUF GAMING-PLUS  |  RAM: G.Skill Ripjaws DDR4 3600MHz 16GB  |  PSU: Corsair RM850x  |  Storage: 1TB ADATA XPG SX8200 Pro, 250GB Samsung 840 Evo, 500GB Samsung 840 Evo  |  Cooler: Corsair H115i Pro XT  |  Case: Lian Li PC-O11

 

Peripherals:

Monitor: LG 34GK950F  |  Sound: Sennheiser HD 598  |  Mic: Blue Yeti  |  Keyboard: Corsair K95 RGB Platinum  |  Mouse: Logitech G502

 

Laptop:

Asus ROG Zephryus G15

Ryzen 7 4800HS, GTX1660Ti, 16GB DDR4 3200Mhz, 512GB nVME, 144hz

 

NAS:

QNAP TS-451

6TB Ironwolf Pro

 

 

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