Core Voltage and Cache Voltage?

[MeDownYou]

I've heard a lot about core voltage before and more voltage = more heat & potentially higher overclock. Could someone explain to me Cache Voltage though? It's a rather unspoken of topic in general.

[runit3]

I've heard a lot about core voltage before and more voltage = more heat & potentially higher overclock. Could someone explain to me Cache Voltage though? It's a rather unspoken of topic in general.

 

The cache has a multiplier just like the core. Increase the cache voltage, increase the cache clock. Most people don't mention it because OCing the cache has less of a real world performance increase, it can also cause instability faster than a high core OC. For example, it would be better to have a core mult. at 47 and cache at 43, than 1:1 with both at 45. This is where most CPU samples run, around 3-400MHz off the core clock. Some stellar chips can run 1:1, but they are rare, especially at anything higher than 4.5GHz.

 

[MeDownYou]

The cache has a multiplier just like the core. Increase the cache voltage, increase the cache clock. Most people don't mention it because OCing the cache has less of a real world performance increase, it can also cause instability faster than a high core OC. For example, it would be better to have a core mult. at 47 and cache at 43, than 1:1 with both at 45. This is where most CPU samples run, around 3-400MHz off the core clock. Some stellar chips can run 1:1, but they are rare, especially at anything higher than 4.5GHz.

 

I am currently testing a 4.2ghz core clock@1.275v  and have the cache running at 3.9ghz, this should be okay, but I can't really increase it anymore or I may experience instability correct? (was gonna try to push to 4.4ghz if this goes well too i'm 20 minutes into prime 95 atm)

[i_build_nanosuits]

I am currently testing a 4.2ghz core clock@1.275v  and have the cache running at 3.9ghz, this should be okay, but I can't really increase it anymore or I may experience instability correct? (was gonna try to push to 4.4ghz if this goes well too i'm 20 minutes into prime 95 atm)

your cache multiplier should always be a little lower than your core for max stability, and the voltage for the cache should also be a little bit less.

[MeDownYou]

your cache multiplier should always be a little lower than your core for max stability, and the voltage for the cache should also be a little bit less.

oh gotcha, the 3.9ghz cache is at 1.2v atm

 

*side note I hit 77C doing 4.2ghz@1.275v guess i'm not going to get 4.4ghz on stock cooler

[i_build_nanosuits]

oh gotcha, the 3.9ghz cache is at 1.2v atm

 

*side note I hit 77C doing 4.2ghz@1.275v guess i'm not going to get 4.4ghz on stock cooler

no, of course you are not...you need proper CPU cooling...haswell chips are tiny reactor, they get very hot very quickly.

[runit3]

I am currently testing a 4.2ghz core clock@1.275v and have the cache running at 3.9ghz, this should be okay, but I can't really increase it anymore or I may experience instability correct? (was gonna try to push to 4.4ghz if this goes well too i'm 20 minutes into prime 95 atm)

Most of the Haswell's I've gotten my hands on could run 1:1 at 4.3-4.5. None have been able to do 1:1 above 4.5, but for those chips they were already 4.7 or higher on core, no legitimate reason to OC cache up besides seeing how high they could go.

Free performance is free performance, as long the temps and voltages are safe I'll take whatever I can get.