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Guest Wasmachineman_NL

Safe voltage for Penryn/45nm Core 2?

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Guest Wasmachineman_NL

I have three QX9300's i'm going to bin soon, what's the safe voltage before it degrades the chip?

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I would generally rely on Intel's datasheet - 1.45v max core and vtt. I wouldn't go higher than 1.55v vcore and 1,4vtt with custom air anyway. 

45nm also hates high vpll - 1.5-1.65v should be enough for all scenarios.

PS. It's all about fsb limit anyway if we take performance into account rather than raw cpu frequency.

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Guest Wasmachineman_NL
10 hours ago, TerraRaptor said:

I would generally rely on Intel's datasheet - 1.45v max core and vtt. I wouldn't go higher than 1.55v vcore and 1,4vtt with custom air anyway. 

45nm also hates high vpll - 1.5-1.65v should be enough for all scenarios.

PS. It's all about fsb limit anyway if we take performance into account rather than raw cpu frequency.

FSB can't be OC'ed on the M6400 anyway without a pinmod, so don't go above 1.45V is a rule of thumb?

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Depends on cooling and vrm. I would keep cpu below 80C and make sure vrm of m6400 may stand the excessive load (no hot parts etc). Actually, 1.8v is quite safe for Intel's 45nm parts with LN2. With air cooling, most reviewers of desktop 45nm quads were using below 1.45v limited by temperature.

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Guest Wasmachineman_NL
56 minutes ago, TerraRaptor said:

Depends on cooling and vrm. I would keep cpu below 80C and make sure vrm of m6400 may stand the excessive load (no hot parts etc). Actually, 1.8v is quite safe for Intel's 45nm parts with LN2. With air cooling, most reviewers of desktop 45nm quads were using below 1.45v limited by temperature.

With this cold weather currently in The Netherlands I might be able to hit 4.x GHz. Maybe even 4.3+ if I have the board modded to use 333/1333 FSB.

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