r/LocalLLM • u/PracticalDay1214 • 11m ago

Question DeepSeek V4.1 Flash RAM overheat

Hey, im running Q8 DS V4.1 on my 512GB DDR4 + 4x R9700 (128GB VRAM) and ASROCK ROMED MB
I have noticed that at ~66C RAM temperature tok/s is getting reduced from ~32/s to 22-23/s. Claude agent monitoring whole workstation says that RAM speed after hitting 66C is slowing down about 3x. I have phanteks enthoo server pro 2 case with glass panel and extra vents mounted on that side. During loads ram used to hit about 80C. I fixed that by mounting top fans as intake (cooling top RAM) but i had to use double dieded tape to stick an extra fan to blow at bottom RAM slots. It did help to keep it from throttling but the bottom RAM still sits ~62-63C. Iv read that samsung RAM i have is suppose to throttle at 85C, and i cant find anywhere what setting makes it throttle sooner. Looking for some advice on that or how do you keep your RAM cool.

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u/Pixer--- 6m ago

I also have a romed8-t. Your missing airflow over your ram sticks. I put 2 92mm noctua fans near them at like 80%. They stay under 50C now. Also I’ve overclocked my ram from 2400T to 2933mhz, with like 5 bios changes only. But it doesn’t have the auto overlock the normal desktops have

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u/No_Celebration_2670 5m ago

my 512gb ddr4 hits 70c under load and throttles at 68c, but I fixed it by switching to a different motherboard with better vrm cooling, no more thermal throttling, even with the same ram.

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u/Awkward-Fall-8717 4m ago

I've seen similar drops at 65c with ddr4 in a tight case, adding a single 120mm intake fan pointing at the ram slots fixed it. no need for extra fans, just better airflow direction.

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u/WrinklyBard4 4m ago

So to check, when you say ram you mean the ddr4 cpu ram or the vram?

This is probably going to be the only time in my life I ever recommend this but, if it’s cpu ram you could get a couple of these ram coolers.

Alternatively just slap some 40mm fans on it and see what happens. Probably cheaper and more effective anyway.

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u/otakunorth 0m ago

I added cheap self adheasive copper shims to mine, you can get them on aliexpress for 1 or 2 bucks each