msi 790 fx-gd70 thread

[Sparky]

What is that 64 bit wall ? You mean the Phenom clocks less in 64 bit windows ? That doesn't make any sense...

Any CPU is like that... 64 bit OS is more stressful than 32 bit OS, since it uses the entire CPU. 32 bit like XP doesn't quite use the whole CPU so it is easier to get a higher overclock on 32 bit XP or Vista than 64 bit.

[hellcamino]

Any CPU is like that... 64 bit OS is more stressful than 32 bit OS, since it uses the entire CPU. 32 bit like XP doesn't quite use the whole CPU so it is easier to get a higher overclock on 32 bit XP or Vista than 64 bit.

I never noticed this with any of my intel cpu's, I am guessing this is due to the difference in the way that intel and AMD handle instructions for 64 bit?

[Sparky]

I never noticed this with any of my intel cpu's, I am guessing this is due to the difference in the way that intel and AMD handle instructions for 64 bit?

Nah I noticed it with my q6600. 3.4GHz 1.45V in XP 32, but when I went to 64 bit vista I could only do 3.2GHz at the same voltage. It was going to take more than 1.5V to get 3.4GHz back again.

I've got my 955 back at stock, CPU NB and HT are at 2600. Going to run prime overnight to be sure NB/HT are fine.

[hellcamino]

Nah I noticed it with my q6600. 3.4GHz 1.45V in XP 32, but when I went to 64 bit vista I could only do 3.2GHz at the same voltage. It was going to take more than 1.5V to get 3.4GHz back again.

I've got my 955 back at stock, CPU NB and HT are at 2600. Going to run prime overnight to be sure NB/HT are fine.

I never noticed tbh, I tested my Q6600 and my X3360 many times and they always seemed to need the same amount of vcore to run at a given speed, I used XP 32 - 64 and Vista 32-64. Running Vista 64 seems to involve a lot of BSOD's at just above stock speeds (3.5-3.8ghz), I haven't tried running XP 64 yet on this system. How does this platform handle a pair of 4870X2's...Anyone?

[TurboDiv]

Now i can relate to the whole situation.. My E6600 in the signature used to be clocked at 3.32 Ghz in Win XP 32bit prime stable for 48 hours, but as soon as i moved to Vista 64bit i noticed that it wasn't stable anymore at 3.32Ghz. At the time i thought it was simply some dust accumulation on my cooler which might have resulted in higher temperatures so i lowered it to 3.28 and forgot about it. Than the next thing i noticed was that Intel Burn test 64bit was "advertised" as the more demanding test for CPU stability than the 32bit test. It all kind of makes sense now...