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2500k - 1 weird core?

post #1 of 8
Thread Starter 
After trying my 2500K at 1.23v at 4.6GHz, it failed with rounding errors after an hour of prime on core3. Understandable, but I started fiddling with all the other various options to try to stabilise it at 1.23v. With everything I tried, it was always the same core that miscalculated in prime, and it always is the same core that miscalculates when I push the chip in any other way.

This wouldn't be particularly strange on its own, but I've noticed that core3 appears to be running faster than the other 3 (it can be on Test 17 in prime while the other cores are on Test 15 after several hours).

Has anyone else experienced this kind of thing? Or is this just normal and I'm taking too much notice of these things?
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post #2 of 8
Well I haven't been able to play with a wide range of SB yet, but my 2500k is the same way except it's core #4 for me.

I even played a bit with setting it's multi lower then the other three cores and yet it will still be the only core to have a rounding error.

Not sure about being 2 tests ahead of all other cores though, that does sound slightly odd. To be one ahead is one thing due to various background tasks running which can slow a core or 2 down a bit more then the other cores.

But yea, sucks to feel like you have just one weak core that is holding you back.
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by rx7racer View Post
Well I haven't been able to play with a wide range of SB yet, but my 2500k is the same way except it's core #4 for me.

I even played a bit with setting it's multi lower then the other three cores and yet it will still be the only core to have a rounding error.

Not sure about being 2 tests ahead of all other cores though, that does sound slightly odd. To be one ahead is one thing due to various background tasks running which can slow a core or 2 down a bit more then the other cores.

But yea, sucks to feel like you have just one weak core that is holding you back.
Yeah I tried setting the core multis manually, too - same core still failed

Very annoying!
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space heater
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post #4 of 8
sadly sometimes you will find that one core is weaker than others in your processor...
its normal, especially on Prime cause Prime95 doesn't like Sandybridge...
    
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post #5 of 8
Same here too except it's core 4 like rx7 D;

Isn't 1.23v pretty low for 4.6ghz anyway? ;x
post #6 of 8
Thread Starter 
Quote:
Originally Posted by GeforceGTS View Post
Isn't 1.23v pretty low for 4.6ghz anyway? ;x
Apparently it was, yea

I've run it for 2 weeks at 1.25v/4.6ghz, though.
Edited by fluxlite - 4/2/11 at 1:59am
space heater
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S-HVH-01
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CPUMotherboardGraphicsRAM
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space heater
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S-HVH-01
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PfSense
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CPUMotherboardGraphicsRAM
Intel 2500k 4.7GHz  Asus P8P67 Pro(B3) 2 x Club3D 280X 3GB 16GB g.skill 1600MHz C9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
Hard DriveHard DriveOptical DriveCooling
8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
OSMonitorMonitorMonitor
8.1 Enterprise Acer GD245HQ (120hz) LG W2420P LG IPS231P 
MonitorMonitorKeyboardPower
HP ZR24w LG 32LH3000 (w/IPS) Razer Blackwidow Antec TruePower New 750W 
CaseMouseAudioAudio
Corsair 750D Modified original G5 Asus Xonar PCIe Sennheiser HD595 
AudioAudioAudioAudio
Tannoy Mercury 5 NAD C165BEE Bowers & Wilkins 683 Cambridge Audio DACMagic+ 
CPUCPUMotherboardRAM
Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Lenovo RD650 128GB DDR4 ECC REG 
Hard DriveHard DriveHard DriveHard Drive
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Windows Hyper-V Server 2012 R2 2 x LiteION 750W 80PLUS Platinum RD650 24x2.5" chassis 
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Intel 4 x 1GbE 
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post #7 of 8
There's an Intel utility that will allow you to adjust the voltage independently per core. You need to raise the voltage slightly (usually 40-50mv) for the other cores and then they'll have the same performance.
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post #8 of 8
Rounding errors usually happen when not enough memory voltage.

Also 1.23 is too low for 4.6, even with super golden chip, you are no where near stable.
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