Will my 650watt psu be able to run a 4870x2 and a 4870 on cf

well i just bought all new stuff for my computer but when i had originally bought my power supply i had bought it for 2 4870s i gave one back and now got a 4870x2 and a 4870 so my question is will my 650w be enough to power both these cards?
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  1. georgep001 said:
    well i just bought all new stuff for my computer but when i had originally bought my power supply i had bought it for 2 4870s i gave one back and now got a 4870x2 and a 4870 so my question is will my 650w be enough to power both these cards?

    It's cutting it close, but if the psu has good 12v rail rating, it could work. If you're building a new psu, get at least 750w, if you already have the 650w unit, try it out.
  2. will do thx
  3. It also has a lot to do with the model of the PSU. If it is a Rosewill etc. then forget it. I would say no anyway. The 4870X2 in CF draws a whopping 517W, that's 12V ~43A, under full load by themselves. That would tax a 750 depending on your configuration, that you didn't include.

    You are very lucky that I stumbled on to this thread. If you are lucky enough to read this in time, I have a link for you.

    PC Power and Cooling SILENCER 750W QUAD S75CF Power Supply Retail at ZipZoomfly


    Offer valid from 8/6/08 to 8/16/08 Only at ZipZoomFly

    List Price: $199.99
    Our Price: $129.99
    Instant Rebate: $70.00
    Mail In Rebate: $30.00 Expires 08/16/08
    Final Price: $129.99 ($99.99 after MIR)

    Edited due to higher wattage than initially realized.

    As per dirtmountain, I had the card combo incorrect.
  4. A HD4870x2 and a HD4870 run in a crossfire configuration will be a about 400w just for the cards alone.
    http://www.atomicmpc.com.au/forums.asp?s=2&c=7&t=9354
    Check your system with this
    http://extreme.outervision.com/psucalculatorlite.jsp
    it doesn't have the HD4870x2 in it's data base yet, but you can use the crossfire 4870s and add another card. Most PSU manufacturers recommend that you run their PSUs at 60% of load.
  5. dirtmountain said:
    A HD4870x2 and a HD4870 run in a crossfire configuration will be a about 400w just for the cards alone.
    Ah, I didn't see that it was a 4870/4870 X2 combo... duh :pt1cable: . That draws 33 amps, which makes the Silencer 750 the perfect fit instead of a little over taxed.

    Unfortunately, the Silencer 610 only has a single rail current of 49A, so it is workable but really tight. I think it would handle it but the fan would be loud.

    It is all mute because by the time he sees this the sale is gone.

    You have to admit, I have done my best to get out the news of the sale.
  6. I've seen the PC P&C 750w for $99 after MIR many times, but thanks for the link that is very refreshing to see somone doing what we should, and helping people.
  7. Sorry I didn't see it, I paid $129 for my Silencer 610. So when I see these prices I scream it from the rooftops. Unfortunately, as with many other things, no one seams to listen. It makes you wonder, why bother.
  8. I have the 610 silencer and ordered a 4870x2. Not sure when it will be here because it is backordered, but once I get it in I'll post the results.

    My System:
    PCP&C Silencer 610watts
    Q9450 @ 3.2ghz stock volts 1.2
    Xigmatek HDTS1283 w/120mm fan
    Gigabyte GA-x48-DQ6
    2x2gb Corsair DDR2 800mhz CL 4
    1 x 300gb WD Velociraptor
    1 x 500gb Seagate 7200.11 SATA
    1 x Asus DVD RW/CD RW SATA
    1 Antec Spot cool fan
    1 120mm LED Fan
    1 120mm Scythe S-flex Fan
    1 120mm fan

    Waiting on the 4870x2

    EDIT:
    I used the PSU calculator linked in this post and came up with 496 watts required. 60% load for my PSU is ~366 so it will definitely be above 60% a little over 80% load actually.
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