Hello, wanting to go HD 5870 Crossfire but not sure if my PSU, Coolmaster Extreme Power 700W is enough. NO OVERCLOCKING. core i7-950 X58A-UD3R syncmaster 2494HS monitor 1 WD SATA 500GB 1 WD SATA 1.5TB 6gb G.skill trident 2000mhz ram 1 5870 atm (want to crossfire with 2)
I would rather look at the 1000 watt power supplies because 700w would be really tight. Two 5870's consume about 600 watts atleast what i've heard of + the 950. : )
And make sure the power supply is compatible with crossfire.
I do not think so looking at the charts from Xbit. They are rated for 120-160w at stock (physical load for each card). The 5830 and the 5850 use the same amount of power and slightly less than my x1900xt. Total system you will be ok but somewhat a little much for your psu so long the rest of the system is efferent. Such as not using a 140w Phenom 2 or a 130w I7 9xx.
It really depends on your entire system, not just the cards. I have a watt meter that measures power draw from my wall.
I don't have two 5870s but my system build should be similar.
i7 930 @ 4ghz
ATI 5970 @ 950/1200
3 sticks of DDR3 1.65v
2 7200 RPM HDD
1 Water Pump
3 140mm fans
3 120mm fans
All this takes 200W idle.
Gaming load goes to 400W.
Prime95 + furmark at the same time load takes 600W.
This is from the wall. My PSU is 80 Plus Silver which is about 85% efficient, so the power I draw from the wall is 15% higher.
This is a more realistic qoute than the specs of each individual components because I overclocked as well. When I don't overclock.
Idle hardly hits 200W, most of the time at 150W-180W
Gaming Load is around 350W.
Prime 95 + furmark load is about 450W.
A lot of people would tell you to get really heavy power supply but most of the time it isn't needed. Its always good to have extra headroom but 1KW is just overkill.
If your not overclocking. A Seasonic 650W with Gold Certification would be plenty.
The powersupply is also modular. I always recommend modular unless you are running dozens of hard drives among other things. Most of the time when someone's powersupply explodes, it isn't because he didn't get a big enough powersupply but rather he didn't get a quality power supply.