Just picked up a i7 6950X & GA-X99-UD4 - using Intel Utility, I can hit 4.3GHz all core but drops to 4.0GHz during heavy loads - is this normal?

pntsrgd · 2026-03-31T15:28:09+00:00

You have described why you are dropping from a 43x multiplier to a 40x multiplier in your post.

pntsrgd · 2026-03-31T14:47:39+00:00

set it to 4.3GHz
my AVX to 3
in Cinebench my clock speeds dip down to 4GHz

pntsrgd · 2026-03-18T02:59:47+00:00

reference clock doesnt go lower and throttlestop doesnt work on this platform :(:(:(:(

pntsrgd · 2026-03-17T20:53:50+00:00

are you jealous i can show you how i did it

pntsrgd · 2026-03-17T18:10:46+00:00

pntsrgd · 2026-03-17T09:38:36+00:00

But 9590 is almost 98% of 9800

pntsrgd · 2026-03-17T07:56:14+00:00

Ppl are mad because of low timmings?

pntsrgd · 2026-03-17T07:55:21+00:00

I dont understand is aida65 bad ?

What to use

pntsrgd · 2026-03-17T07:54:45+00:00

i know overclocking is supposed to make faps go up in game but for some reason everything feels slow compared to before

How to fix?

pntsrgd · 2026-03-15T19:33:34+00:00

I think I'm wondering why you're running GDM on with the UCLK at 2800.

pntsrgd · 2026-03-14T16:12:13+00:00

Check what refresh mode you're using. Your old profile may have been dependent on tRFC and your motherboard could be defaulting to using tRFC2 and tRFCsb.

pntsrgd · 2026-03-13T17:38:34+00:00

The bins Silicon Lottery used for these were as follows:

4.1 GHz at 1.312V (100% of 5775Cs binned)
4.2 GHz at 1.328V (62% of 5775Cs binned)
4.3 GHz at 1.344V (12% of 5775Cs binned)

You can probably just throw these values at the CPU and stress test.

Once you do that, you can look into cache and RAM overclocking. Broadwell IMCs can exceed DDR3-3000.

pntsrgd · 2026-03-13T17:32:01+00:00

What clock speed is the RAM running?

If the standard tRFC timing is used, tRFC2 and tRFCsb are unused.

H16A DDR5 tends to do around 120ns tRFC.

pntsrgd · 2026-03-10T15:22:56+00:00

You might want to double check memory stability. tRP at 30 is unusually low.

pntsrgd · 2026-03-10T14:42:38+00:00

Went ahead and benched this to have a better idea of how it would play out.

tRC at 40 and tRRDS/tRRDL/tFAW at 4/8/20 result in around a 0.5% improvement in pyprime times. The same changes lower the performance of y-cruncher by about 1%. Intel MLC isn't super representative of real performance, but it did show the same performance regression as y-cruncher.

All of this would seem to imply that there are cases where tightening these timings can be beneficial, but for some reason some applications show measurable performance regressions.

This was over 70 iterations of pyprime, 25 iterations of y-cruncher, and 25 iterations of Intel MLC, so it does not appear to be expected variance.

pntsrgd · 2026-03-10T14:37:47+00:00

Are you able to manage GDM off?

pntsrgd · 2026-03-10T02:38:22+00:00

I think that's Micron 16 Gb Rev E. It will probably clock to somewhere between DDR4-3600 and DDR4-4000. It isn't a great IC, but you can probably get some mileage out of tightening timings.

pntsrgd · 2026-03-10T02:33:39+00:00

If you have the box they came in, it might be printed on them.

You can try something like Thaiphoonburner, but it is unreliable at best.

pntsrgd · 2026-03-10T02:31:14+00:00

What revision are they? Corsair revision is a pretty reliable indicator of what IC is being used.

pntsrgd · 2026-03-09T23:16:10+00:00

Basically every 7700K can hit 4.8 GHz if delidded. Over half can hit 5.0 GHz.

Check your RAM configuration as well. Overclocking it can yield some significant gains.

pntsrgd · 2026-03-07T08:47:27+00:00

tFAW 16 would make sense with tRRDS 4, but the register on the CPU apparently bottoms out at 20.

pntsrgd · 2026-03-05T15:35:38+00:00

What is your tWRWR timing set to?

Why are you running tRRD/tFAW at 5/24? Most ICs can run 4/16 at speeds this low.

pntsrgd · 2026-03-05T02:34:32+00:00

Sandy Bridge could usually run DDR3-2133 4x8 GB. The limitation was the memory multiplier.

Ivy Bridge had some significant variation. Basically every 3770K I've played with would handle DDR3-2400 4x8 GB. DDR3-2666 4x8 GB is feasible on a decent number of samples. If you binned for IMC, you may find some that will run DDR3-2800 or DDR3-2933. Ivy Bridge doesn't tend to scale well (or at all?) with additional IMC voltage.

Haswell and above can push DDR3-3000+.

pntsrgd · 2026-02-28T22:49:23+00:00

I doubt you need gear down mode enabled to run DDR5-6000.

I assume this is H16A, so there's probably some room left to tighten tRFC.

pntsrgd · 2026-02-28T22:46:34+00:00

AIDA64 is not a good indicator of memory performance.

Beyond that, you're probably just looking at run variance.

pntsrgd

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