hd 4850 crossfire on a sx38p2 pro

[daymiel]

hi everyone! i just wanna know if my stock psu (450w) can handle all of this:
sx38p2 pro
INTEL Q6600 2.40ghz G0 (stock)
SAPPHIRE 100242-1GL Radeon HD 4850 1GB crossfire
2 x CORSAIR DOMINATOR 4GB 1066 (8gb)
1000 gb seagate sata II hard drive
400 gb western digital sata II hard drive
500 gb seagate sata II hard drive
logitech G9
G15 gaming keyboard
logitech z680 5.1 surround system
dlink dwa-130 wireless N usb adapter
microsoft lifecam

i ordered a pair of 4850 from newegg but they sent me an older version(red card) and a newer version(blue card) of 4850. installed it and tested, wouldnt pass vantage. my monitor just went black and it says out of range for several times. figured that its just the drivers, reinstalled vista x64 and installed ATI drivers and i did vantage a couple of times without problems. run memtest for the night and it was good. tried vantage before going to work, and i got bsod. i tried one the card(the blue one) and it wouldnt pass vantage. tried the other one, no problems. tried both of them again and i played crysis for 4 hours without problems. also set 70% fan speed on both 4850 and temps are good. 44 at idle and 65 at load. its loud though. is my psu in the brink of being overmatched or is it just the drivers? and btw i used 3870 for crossfire without any problems? if it is, what are my options? underclock the cards? i love these 4850s and i wanna keep them . i also saw that a lot of people using 4870x2 or a gtx on their sx38p2. if i cant on my current psu, can i do any mods? thanks

 

[SolMiester]

Well, if it were me, I wouldn't risk a borderline PSU with the rest of your kit, that's for sure.....you need to establish the amperage of the 12v rails on the PSU, however, I'm just surprised CF worked...

 

[Denithor]

Go for the Corsair 650TX, I think it's on sale (or rebate or something) for about $70 at newegg right now.

 

[daymiel]

Originally posted by: SolMiester
Well, if it were me, I wouldn't risk a borderline PSU with the rest of your kit, that's for sure.....you need to establish the amperage of the 12v rails on the PSU, however, I'm just surprised CF worked...

thanks for the heads up. i just wanna know what is the worst case scenario if i continue using crossfired 4850 with my stock 450 watt psu. btw my crossfired 3870 work like a charm. never had issues. never turned off my pc for a month played, played everyday, warcraft, crysis, cod and etc.