HD 4850 crossfire problem

[Arkahm]

Hey guys!

I have 2 4850s, but i made one mistake, when i got them. I got the original asus EAH4850 and then i got the asus EAH4850 TOP card, just slightly oc'd

and I can play TF2 just fine, and few other games, when I play hl2 episode 1 it will reboot my pc at a certain point, HL2 Ep2 will reboot right away COD4 will reboot every 30-45 minutes but i can play TF2 for hours

I have Vista 64 ultimate

asrock p45r2000 wifi
gskill 1066 ram 4 gigs
intel q6600 quad core
and the 2 ati cards, im using both bridges i used one but i get mixed answers on that question whether to use 2 or 1

Everything in my computer is at stock settings

 

[erocker]

What power supply are you using? Have you checked the temperatures of your CPU, GPU, etc? Is your RAM setup (timings, voltage, etc?)

Use both CrossFire bridges.

 

[Arkahm]

ok i knew i forgot somthing, i have a HEC Zephyr 750 watt psu, other than that i have no idea on volt or timings on teh ram, all i know is its running at 1066

 

[JATownes]

I am using a Visiontek HD4850 and a MSI HD4850 OC Edition but I only use one bridge. When I use 2, I get MAJOR graphical anomalies. I would check your RAM timings and volts, as erocker recommended.

 

[Arkahm]

Ok well i found out that, it only crashes, after i beat a mission it plays a sequence while loading, if i dont skip that movie, after it loads it will reboot.

I will take that other bridge off i just put back on,

but where do i find the timings and volt, cause this company tells you to get a few different brands of ram mine being one of them