PE II X3 720 BE On Gigabyte 790FX-DQ6 mobo Do I need ACC for OCing past 3.5Ghz?

[Alxea]

I have just messed with this new cpu for about a day. It gets 3.5ghz on stock volts. 3.3ghz stable in windows. But even with 1.55v I can't get into windows at 3.5ghz from the bios. However on windows it hits a wall at 3.7ghz with multiplyer changes only in amd overdrive. Then FSB hits a wall at the same place. I went upto 1.6v for like 5 mins didn't help any.

I haven't messed with it much. I don't have much experiance in OCing phenoms since I had a 9600 BE for the past year it didn't OC at all. I been thinking about a AM3 board with ACC on it with a SB750. Will this really give me a OC greater then 4ghz. Or does it really make a difference? The SB600 could be limiting my oc that much.

It only gets to 40C on full load at 3.5ghz Just changing the speed past 3.7ghz it freezes. Any idea if I can get any more out of this who have the same processor? Thanks!

[i found nemo]

if you get the right mobo with acc on you can have x4, maybe a lower speed but an extra cpu.

[G0ldBr1ck]

What settings are you using for the CPU NB? That board dont allow for voltage increase on NB from bios and can limit your HT OC if you dont lower the NB multi.

Oh and no, ACC will not help with your OC.

[vinister]

I am kind of in the same boat. I'm running an X3 in a DFI M2R with SB600. I'm at 3.6Ghz prime stable. What cooling are you using? I'm under water, temps are about 33C under load, with 1.4V.

I can get into windows at 3.9Ghz with 1.55V, but not prime stable, not for 10 seconds. 4Ghz it will post and half-load windows, but crashes before login screen.

So I have the same limit as you, 3.5-3.7 Ghz seems to be the max for these chips on SB600 boards. I do think SB750 would help both of us, I mean they advertised easier overclocking as a feature of the new SB, so it should help. I am waiting for the MSI 790FX-GD70. (http://global.msi.com.tw/index.php?func=proddesc&maincat_no=1&cat2_no=171&prod_no=1740)

I don't really care if I can ever unlock the 4th core. I upgraded from a 9850BE and I have absolutely massive gains in all my games. This is a gaming computer, I couldn't care less about synthetics. 3 Cores with higher clocks and massive cache, totally owns the old slow quads.

[G0ldBr1ck]

I do think SB750 would help both of us, I mean they advertised easier overclocking as a feature of the new SB, so it should help.

ACC has been tested many times now and has shown to have no gains in overclocking with PHII. However there could be a slight advantage from the SB750 over the SB600 but do to something other than ACC.

I have 790gx/sb750 board and the 790fx/sb600 Gigabyte DQ6 board and I can get the exact same OC on the DQ6 as with the other.

[Alxea]

Useing a NT06-L with a scythe 120mm fan that gives 130 air flow. Idles at 25C. But my room is kind of cold and my case is just blasting with scythe 120mm fans in it. lol I am messing around with my board more to see if I can get anything more out of it. I am use to OC's taking weeks just to perfect so maybe I just need to find a sweet spot. Still a hell of a difference its made compared to me old CPU. I'm happy with it. Same result, this speed owns my quad.

[Alxea]

I'm beginning to think its my powersupply. 20A and 18A on the dual rails. I put all kinds of volts into this cpu. It seems I get deminishing results as it gets to 1.5v when on 1.4v its stable at 3.4ghz but as I get it upto 1.5v and stress it, my comp freezes after about 30 mins. When the highest clock I got so far on it was 3.75Ghz.

Any bets its the powersupply? I want to get a corsair 750W powersupply with a single 60A rail. My old 550watt powersupply doesn't seem to cut it anymore.

Update...

Core 0: 20x 1.55v 4Ghz
Core 1: 20.5x 1.55v 4.1Ghz
Core 2: 18.5 1.55v 3.7Ghz

Did some tests on each core. The 3nd core is one of the problems. The 3nd core fails at 3.7Ghz so its not stable at those volts. The other cores are doing good.

[i found nemo]

maybe a lower speed but an extra cpu.


.

Oh and no, ACC will not help with your OC.


*ahem*



Update...

Core 0: 20x 1.55v 4Ghz
Core 1: 20.5x 1.55v 4.1Ghz
Core 2: 18.5 1.55v 3.7Ghz

Did some tests on each core. The 3nd core is one of the problems. The 3nd core fails at 3.7Ghz so its not stable at those volts. The other cores are doing good.




yep, so just do diff multi's for each core and there you go. they don't all have to be the same speed.

also regarding acc

we do math to see gain

total cpu mhz ( 4 ghz 4.1 and 3.7 ghz ) = 11800 mhz

with extra cpu, but acc, ( i think acc means you have to run all cores same speed so we will say 3.7 ghz *4 to be safe ) = 14800 mhz

also try less voltage and then test 3rd core for max. idk, give it a shot.




This is a gaming computer, I couldn't care less about synthetics. 3 Cores with higher clocks and massive cache, totally owns the old slow quads.

actually enabling the fourth core would add 512k more cache..

and if the game supports 4 core cpus .... you see where i'm going? 4 core always faster than 3 as far as multi-thread supported softwear goes, and physically ( in multi threaded supoported softwear ) cuz there may be less speed, but a higher multiplier ( x4! ) of cpus

and i am not reffering to the old x3's or x4's reffering to newer ones.

[nanohead]

I can't even boot my 720 with ACC enabled. It turns on the 4th core, but I guess my 4th core is bad, so it BSODs each time.

I can get it to 4Ghz without ACC anyway!