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my 2600k overclock slower than others

post #1 of 21
Thread Starter 
I have a 2600k overclocked to 4.5G @ 1.28v
and when running LinX, Super Pi etc, the benchmark was obviously slower than other similar setups.

Brief information of my rig
Intel 2600k
Corsair H70 cooler (with 2 Gelid Wing 12 PL)
Gigabyte P67A-UD5-B3
4GB x 4 Corsair Vengeance DDR1600 running @ 1600 9-9-9-24-1T
Asus GTX 480
Intel X25-M 120GB G2 Harddisk
4 SATA 7200RPM Harddisk
Corsair HX850 PSU

now, this is my result(this is 4.7G overclocked, because I lost the capture of 4.5g)



and this is others result(he even use lower end 2500k)


my rig 20% slower than his in the Gflops.

my rig run very stable, no BSOD no Halt no anything after Prime95, Linx, IBT and OCCT stress.


about super PI 1M, I tried to run @4.5G earlier, my result was 8.437
while other people overclock to 4.5, most of them got like 8.1xx

and now at AIDA64 benchmark, in Memory tests, my rig lost to a stock speed 2600HT.





The CPU test my rig was faster than the 2600HT, except one test the CPU
AES



my bios overclock config is like this
BLCK 100.3
Multiplier 45
RAM Voltage 1.54
Vcore 1.28
QPI/VTT 1.2
CPU PLL V 1.74
C1E, EIST and other power management are disabled
Spread Spectrum disable
Ram PC1600 9-9-9-24-1T

this is pretty much what I've configure my overclock.


I've heard when you overclock and your Vcore not enough will cause performance drop, so I tried to increase the Vcore to as high as 1.425v
but the performance is exactly the same.


I am very worry if my CPU or RAM or Motherboard is detective or I did anything not good enough for the overclock,

experienced user can you please help me ? Thanks!
    
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post #2 of 21
I used to notice this on my Q9550 too vs others. I guess it's just the RAM...
post #3 of 21
It's fine. Do you have SP1 installed for Windows 7? That will increase your Gflops.

Also try turning off HT and running Linx .
post #4 of 21
Maybe try overclocking your NB?
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post #5 of 21
Thread Starter 
Quote:
Originally Posted by thealex132 View Post
Maybe try overclocking your NB?
don't know Sandy Bridge has a NB
    
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post #6 of 21
Thread Starter 
Quote:
Originally Posted by cory1234 View Post
It's fine. Do you have SP1 installed for Windows 7? That will increase your Gflops.

Also try turning off HT and running Linx .
yes, my windows 7 64bit ultimate is with SP1 and installed all the updates.
I disabled the HT to run the LinX already, also updated the Linpack Binaries to the lastest in order to support AVX
    
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post #7 of 21
Thread Starter 

just ran a Supe Pi 32M test
result :8m8.370s

also significantly slower than others have the same CPU and same clock
    
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post #8 of 21
@darkinners

What´s your setting regarding "TurboPower Limit" and Core Current Limit?

Check so that it doesn´t throttle down during your LinX runs.




Quote:
Originally Posted by thealex132 View Post
Maybe try overclocking your NB?
He probably mean that should overclock your "IMC" (memory controller), he obviously don´t know how the Sandy Bridge works, you can´t overclock the IMC separately with Sandy Bridge, it runs the same as the core.
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post #9 of 21
Thread Starter 
Quote:
Originally Posted by Ghostleader View Post
@darkinners

What´s your setting regarding "TurboPower Limit" and Core Current Limit?

Check so that it doesn´t throttle down during your LinX runs.






He probably mean that should overclock your "IMC" (memory controller), he obviously don´t know how the Sandy Bridge works, you can´t overclock the IMC separately with Sandy Bridge, it runs the same as the core.
I disabled Turbo boost in Bios, so the powerlimit is not selectable, should enable Turbo Boost? Thanks for your answer


I tried enable turbo boost in order to break the wattage limited, I both Watts and AMPs set to max 300 and run the LinX again.

HT off 97 Gflops
HT on 101 Gflops

not much a difference, people told me that would have BIG difference
Edited by darkinners - 4/4/11 at 8:17am
    
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post #10 of 21
Maybe you should turn on HT? As far as I saw you have it off. If You want to campare with CPUs that have HT on you can forget about it

Edit: Sorry didn't saw HT was off on the other CPU.

Edit2: do you really care about synthetic benchmark? LOL... Then good luck with it
Edited by sp4wners - 4/4/11 at 8:05am
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