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Monday, 15 November 2010 06:27

AMD Athlon II X4 645 in the labs - oc/uv

Written by Eliot Kucharik

athloniiquad_logo athlon_ii_x4_645_small

Review: Slight speed pump for the Athlons

amd_athlon_ii_x4_645_cpuz

We have already stated the specs, so here the CPU-z screenshot which also stated that the new CPU is one of the new C3 steppings.

 

Undervoltage:

While AMD has reduced the VCore to 1.35V, we checked how much lower we could do. With our board the lowest was 1.275V with stable prime. Of course each CPU and board behaves differently, so make sure to run Prime95 to ensure stability.

amd_athlon_ii_x4_645_uc_prime_ev

 

Overclocking:

First we checked how high we could go without increasing the VCore. Sadly our board did increase the VCore to ~1-38V but without this slightly increase we would not have managed a stable prime at this frequency anyways. Also, depending on CPU and board your results may vary.

amd_athlon_ii_x4_645_oc_stock_prime_ev

 

We could manage a boot with 3.80GHz but it was impossible to achieve a stable Prime95 result regardless of the used voltage.

amd_athlon_ii_x4_645_oc_3800_cpuz

 

With 1.48V we could manage 3.50GHz stable:

amd_athlon_ii_x4_645_oc_3.5_1.45V_prime_ev

 

Regardsless of not beeing prime-stable for the time beeing, we tested our overclocked CPU with 3.60GHz with 1.55V.

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Last modified on Wednesday, 17 November 2010 06:58
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