Prime Blend returns 1 error - Rounding error

wildman

wildman

wildman

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I put a relatively mild OC on my 2500K

My notherboard is MSI P67A GD65
Ram is the OCZ Platinum low voltage running 9,9,9,24 timings at 1.35 volts @ 1600mhz

CPU settings were x44 multi to get to 4.4ghz, vcore was on 1.25v. I set vdroop to low, enabled PLL Overvoltage and left pretty much everything else to auto.

I ran Prime Blend just for an hour as I wanted to see what the load temps were like. At full load all 4 cores were betwween 52 and 55 °C

The rig appears stable. WIn 7 installed with no issues, all necessary drivers for mobo, gfx installed with no issues. I have not had any BSODs in Windows. The system feels stable but obviously there is something afoot as I keep getting the rounding error in prime blend "FATAL ERROR: Rounding was 0.5, expected less than 0.4"

I am thinking it could be because of the following but I am really not sure

1. Not enough vcore to keep CPU stable underload ? I thought 1.25 would have been more than enough for 4.4 or I am deluding myself here ?
2. Fubar RAM ?
3. Northbridge ?
4. Incorrect bios settings ?

If anyone Else is running the same motherboard could they please let me know what other settings other than those Ihave said I changed above I need to look at ?

I was thinking of maybe kicking the RAM down to 1333MHz with the same timings in case it was a memory error, but I ran the memory test on it and both modules passed.
 
Ok i did a few changes in the bios

Disabled the following -Limit CPUID Maximum,Power Technology,C1ESupport,OverSpeed Protection,Spread Spectrum

Enabled these 2Execute Disable Bit Intel Virtualization Tech

increased RAM voltage to 1.5
chnaged vcore to 1.2150

Prime blend ran for 1h 30 mins before I stoped the test.

No errors, Core temps hit 51 C under load

i think i got more headroom for clocking here
 
changed multipler to 46
increased v core to 1.240v

prime blen has been running for just over 30 mins, everything seems ok so far. Temps are core 1 = 51, core 2 =49, core 3 = 47, core 4 = 45

I think increasing the RAM voltage to 1.5 has helped

but I can;t help think there is something not right here. The vcore seems low for a 4.6 clock, and the core temps seem to low also, but I have checked these with the MSI COntrol center and core temp and they are both reporting the same results +/- 1 °C ??

if 1.35 vcore is the safe top end i ahve still got another 0.11volts to go, how much more increase coudl thei yield ?

This is not watercooled, well not properly watercooled, I am using a H50 with a 120mm drawing air from outside the case into the rad.

Ambient temp in the room is 22, case temp is 26
 
Dont complain about low temps around here that will get you lynched :) if temps are to low your not clocking it high enough :)
 
Sayso said:
Dont complain about low temps around here that will get you lynched :) if temps are to low your not clocking it high enough :)
Click to expand...

Agrred :) Normally I take the line of 'if its not hot enough to heat up my office or fry and egg on it needs more overclocking' !!

I think I am just suprised at how easy it has been to get this cpu running stable ar a 40% overclock without having to phone the national grid first and say crank the volts up to my house I got me some intel chips to fry :P
 
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