AMD 955 not stable at 4Ghz

[alex2399]

Hello,
I'm trying to overclock my AMD 955 to 4Ghz but i can only run prime95 for 15-20 min before i get a blue screen or my pc reboots, i tried different combinations of CPU core multiplier, HT ref. clock... I raised my voltage to 1.475 but my CPU temperature went up to 60 C.

Any suggestions to have more stability?

Also i'm planning to have another 4870 in crossfire, would i have to upgrade my PSU?

AMD Phenom II X4 955 Black Edition
MSI 790FX-GD70
XFX Radeon HD 4870 1GB 256-bit GDDR5
G.SKILL 2GB (2 x 1GB) 240-Pin DDR3 SDRAM DDR3 1600
Thermaltake Contac 29 120mm CPU Cooler
hec X-Power Pro 600W

 

[beanoslim]

My 955 never made 4ghz, maxed out @3.9 1.475v.

What cooler are you using, possibly get a serious cooler and whack some more voltage into it.

I never like going over 1.5v, I'll always take the lower OC and lower temps over the maxed out OC.

Don't know much about Hec but that psu only has 2x pci-e connectors.

I think the 4870 needs 2 pci-e connectors for each card so you might need an upgrade.

 

[alex2399]

My cpu cooler is a thermaltake Contac 29 with two 120mm fan, i'm pretty sure it can't make it to 4Ghz with a little more tweaks but i just don't know what to do.

For the crossfire 4870 i think my PSU have all the connectors needed but now that i know more about power supply's i'm pretty sure it's a cheap one compared with other 600w PSU even if it did the job well so far.

It's my first time build.

 

[beanoslim]

Well I and a friend of mine on his am3 system tried and failed at 4ghz and it got very hot.

If you are just upping your multiplier there is no need to change the other settings.

If you start changing the bus speed/htt then you have to take the effect on the memory into account.

HD4870–500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)”

4 pci-e needed for crossfire 4870, pretty sure your psu only has 2.

Like you say it would be a good idea to upgrade anyway to a higher quality unit and probably 650w plus.

Heres a few ideas -

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207002&cm_re=650w_xfx-_-17-207-002-_-Product

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012&cm_re=corsair_650w-_-17-139-012-_-Product

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151088&Tpk=seasonic%20650w

They all have 4x pci-e and are good brands.

Hope this helps. [:bohleyk:1]

 

[alex2399]

Best answer selected by alex2399.