Massman

Currently working on an X58 motherboard round-up and yesterday I had the time to test the overclockability of the rampage 2 extreme.

I didn't go for the excessive voltage results as I'm still on stock air cooling (awaiting mounting bracket from Noctua).

BCLK:

221MHz is no problem, even on stock voltages. Haven't been able to surpass the 222MHz barrier, which seems to be a chipset/motherboard related problem. Officially, manufacturers tell users that going beyond 222MHz bclk is a nogo, as the chipset is somehow limited to that frequency. Recently, more and more motherboards pop up, though, that give you the chance to break the limit and hit 230-235MHz!



MEMORY FREQUENCY:

Of course, overclocking the memory is limited to the memory chips, as the maximum frequency varies from kit to kit. However, certain motherboards can make your memory overclock just a tad higher.

Stock voltages:

668MHz CL7



651MHz CL9



Ironically, CL9 clocks much worse

Elevated voltages (1.45/1.85v):

850MHz CL7



1001MHz CL9



Note: when I did the same tests on the Intel DX58SO motherboard, I only achieved:

980MHz CL9



Althought the benchmarks (and thus request for stability) is different, I can tell you that even with 1.95v, I could not run 1M above 1GHz CL9.

Kudos for the R2E, in other words

CPU FREQUENCY

Using stock voltages (1.15v/1.8v pll) I found no difference between HT-on and HT-off overclocking:





Using a slightly higher voltage (1.2v/1.89v pll), there was a difference of 75Mhz between enabling and disabling HT.





To be honest, I'm quite impressed by this cpu: I'm closing in on 4GHz on stock air cooling using only 1.224v. TO BE CONTINUED



OTHER RESULTS

Fastest 4M run using stock voltages:



Fastest 4M run using elevated voltages:



Fastest 1M using elevated voltages:



995MHz 3Dmark06 stable:



When the Noctua mounting bracket arrives, I'll continue with more extensive testing.

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thorgal

Let me add mine with Gigabyte EX-58 Extreme : straight boot to the desktop :



http://valid.canardpc.com/show_oc.php?id=487465

1 Bclk higher = no boot...

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