PHENOM 2 X4 955BE @ 3.6 GHZ, WIN 7 PRO 64, 4 GB DDR1600 G SKILLS, asus board compatible xfire but only 8x
PREFERRED WEBSITE(S) FOR PARTS: ncix and newegg CANADA
PARTS PREFERENCES: (e.g., if you will only use ATI cards, want PhysX card, prefer XFX cards over Sapphire cards, etc., tell us)
OVERCLOCKING: no (for GPU) SLI OR CROSSFIRE: YES
MONITOR RESOLUTION: 1920x1080
I'm planning an upgrade for my PC. I have an asus board with 8x compatible crossfire. Should I look for a used 5770 for 100$ and put it in my pc? I have only a 500W PSU and the crossfire is only 8x... and the bottleneck will to be the CPU and not the GPU?
I'll will check te real consumption of my system and detailed spec of my PSU. Note that the 6770's clock spee is 50 Mhz faster So the power should be a little more on the 6770. Because if a xfire of 6770 consumme 200watts, I have 300 spare watts for the rest of my computer (125W for the CPU and the rest). I'll check if my PSU can be pushed at 100% of the 500W.
5770 xfire. Still recommends 600+ with 55 amps on the 12v rail. 36 amps on the ocz psu if you have the modxstream one.
Pulls 400 at least at load which doesn't leave you much room to overclock your cpu if you have any intentions in the future. I was also looking at an xfire setup with my replaced 6770 and had the same psu. Did a little research myself when I was contemplating it.
I don't want to discourage you but I don't want you to blow your system. If you can go with a 7800 series/ 6950/ GTX 560 ti (or non ti)/ 6870. I've seen the 6870 going for the low 100's on ebay.
You will notice that a P35 with an 8x/8x PCI-E 1.0 config does consistently better than a 16x/4x PCI-E 2.0 config even though a 4x 2.0 slot provides the same bandwith as an 8x 1.0 slot. For some games the determent to using a 16x/4x is small, and with others like Crysis it's pretty big. If you want more consistent performance get the single 7770, or better yet a 6870.