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XMP Profile 1866 dropped to 1333 after prime95 stress test fail

301 views 3 replies 3 participants last post by  Sanxel 
#1 ·
The other day I've been testing my overclock stability(APU A10-7890 4.4GHz) in prime95 custom, out of place, FFT size 768kb and 12Gb RAM.
It's been stable about 4 hours, then I'm coming back and see the bios screen which says something about boot fail and the need to load optimized defaults, because your hardware have been changed. Then I don't do that but just select "go to bios", and see that all my settings are in place and XMP profile says "Profile 1" as always, BUT the frequency says 1333MHz instead of 1866. Again, I only overclocked CPU multiplier, didn't touch memory, NB or GPU.

Then I just have loaded "optimized defaults" and my saved bios profile with all my bios settings. And it's back to 1866Mhz. Ran memetest 13 hours, it's 0 errors.
I guess I need to raise NB voltage or DRAM(it's 1.5V currently, by the way, it says 1.488 in bios for some reason) and retest the overclock. Is this drop in frequency like the built-in protection in modules itself or the mobo? Did somebody encounter this?
The moterhboard: Gigabyte GA-F2A88X-D3HP
Memory: Crucial: BLE8G3D1869DE1TX0.16FED 2x8GB
Thanks
 
#2 ·
If XMP profiles are giving you problems just enter the memory settings and volts manually and see what happens when stress testing.
 
#3 ·
First off I highly recommend testing the RAM by itself first with something like memtest86+. This will at least tell you if the memory itself is stable so you know if you need to touch DRAM voltage.

It was probably just a minor hiccup when the BIOS reverted to defaults something got messed up. And about 1.5v being read as 1.488v that is pretty normal to have a minor discrepancy between set voltage and read voltage. Keep in mind though even software / BIOS readings aren't accurate, if you want to know the real voltage you have to use a multimeter.
 
#4 ·
Quote:
Originally Posted by Gunderman456 View Post

If XMP profiles are giving you problems just enter the memory settings and volts manually and see what happens when stress testing.
Thanks, will try that.
Sorry if bad english. About the memory, I actually successfully tested it together with the cpu, the same way(in prime95), but at 4.2Ghz 1.33v. I had left it over night, so it was about 9 hours. And I set that for P5 P-State using AmdMsrTweaker. But actually when I launched "Valley" benchmark simultaneously with prime95, it crashed after 20 minites. Then lowering frequeuncy to 4.1Gz, Valley tested out for about an hour without problems.
I'll try to retest 4.4 with some more Vcore(It was 1.41) and NB voltage for now. Then maybe manually set memory timing.

One more thing. Today I just wanted to check if the memory will work with Comman Rate 1T, After setting it, the PC didn't boot, but after powering off/on, it just reset memory frequency to 1333Mgz, but Command Rate stayed at 1T. So this behavior like saves from having to reset CMOS, I guess.
 
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