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Thread: need help with psu for crossfire

  1. #1
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    Default need help with psu for crossfire

    do i need a new psu for a 7850 crossfire
    specs are
    gigabyte 970-ud3p 8+2 phase, fx6300 @4.7 with 1.43 volts, gpu vtx3d 7850 1gb stock, xfx double d 7850 stock, g.skill 2x4gb 1600, corsair h100i aio, 1 ssd drive for boot 1 sata 500gb storage, liteon dvdrw , 6 case fans psu i have now is a tagan 530w u15

    should i get a new psu i was looking at the tx650 v2 but not to sure about it

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    Default Re: need help with psu for crossfire

    I'd just go to this site first.

    eXtreme Power Supply Calculator

    Put all your details in, read the bottom notes so you know what to pick for aging and what not, and typically try to find a PSU that has about 30% more capacity than what your system will need. From what I saw, I say that you may not NEED a new PSU, but a 750w would be more preferably to crossfire so you have that head room and things run cooler.

    Haha, I'm leaving what I just wrote because I think it's funny. Just saw the Johnny guru review of your PSU and he says it's basically crap! Because of that I would say DEFINITELY get a new PSU before you try to run Crossfire. You may be burning out more than the crappy unit if it goes bad! Try going for a gold rated one. Seasonic x and the cooler master v series (full or semi modular, your preference) are great choices at 750 watts.

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    Default Re: need help with psu for crossfire

    Quote Originally Posted by fx63007850 View Post
    do i need a new psu for a 7850 crossfire
    specs are
    gigabyte 970-ud3p 8+2 phase, fx6300 @4.7 with 1.43 volts, gpu vtx3d 7850 1gb stock, xfx double d 7850 stock, g.skill 2x4gb 1600, corsair h100i aio, 1 ssd drive for boot 1 sata 500gb storage, liteon dvdrw , 6 case fans psu i have now is a tagan 530w u15

    should i get a new psu i was looking at the tx650 v2 but not to sure about it


    Easy one! Yes you do. It is not only wattage it is quality of the PSU. You can use the calculator if you want an idea on power usage, but simply put 530w does not offer enough extra headroom. If your system will take up 500w under load you will be running your psu close to 100% for extended periods of time. Not a good idea. Move up to a 750-800w psu. Get the best quality PSU at the highest wattage you can afford.
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  4. #4
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    Default Re: need help with psu for crossfire

    First, welcome to PureOC. If I am reading your specification correctly, I would skip the crossfire. From what I remember, the 970 chipset from AMD runs the second PCIe slot at 4x and while the first slot is x16. Which means that you will only be allowing 4x speeds on your second card which will prove little gain in crossfire. I would look into selling the 7850 you have and maybe spend a little money and get a better single card solution. This will omit you from having to get a higher wattage PSU and save some money. While Sandy is still on the right track with getting a better PSU will prove to be beneficial in the long run, but that can be done later.

    Maybe look into a R9 280x or even a R9 290 since pricing has come down quite a bit on these cards. I recently picked up 2 R9 290 for about $330 a piece on TD which is very good for performance to dollar ratio.

    Unless you are running a 990FX chipset which has enough lanes to run GPU in crossfire in x16/X8 mode or most of them running x8/x8 in crossfire. There are only a handful of motherboards from AMD that allow x16/x16 and all of them cost $200+.

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    Default Re: need help with psu for crossfire

    Quote Originally Posted by jasontaros View Post
    if you are interested i have a deepcool Dq1250 watt 80 plus platinum that i could sell you it retails for 249.99 will sell for 125 plus shipping
    That's a good deal
    WELCOME TO PURE OC

  7. #6
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    Default Re: need help with psu for crossfire

    Quote Originally Posted by Solara2xb View Post
    First, welcome to PureOC. If I am reading your specification correctly, I would skip the crossfire. From what I remember, the 970 chipset from AMD runs the second PCIe slot at 4x and while the first slot is x16. Which means that you will only be allowing 4x speeds on your second card which will prove little gain in crossfire. I would look into selling the 7850 you have and maybe spend a little money and get a better single card solution. This will omit you from having to get a higher wattage PSU and save some money. While Sandy is still on the right track with getting a better PSU will prove to be beneficial in the long run, but that can be done later.

    Maybe look into a R9 280x or even a R9 290 since pricing has come down quite a bit on these cards. I recently picked up 2 R9 290 for about $330 a piece on TD which is very good for performance to dollar ratio.

    Unless you are running a 990FX chipset which has enough lanes to run GPU in crossfire in x16/X8 mode or most of them running x8/x8 in crossfire. There are only a handful of motherboards from AMD that allow x16/x16 and all of them cost $200+.
    Very good point Kenny. I overlooked the 970 limitations.

    So there you are sir. 2 options. But if you are not replacing your board I think Kennys idea is the better option.
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  8. #7
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    fx63007850 is offline

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      • PSU:
      • ocz zx 850 watts
      • Cooling:
      • ek cpu block, ek 360mm, st30 240mm rads, ddc-1t 10w res alphacool cape pro 150ml, 3/8 fittings, mayhems x1 premix , 9x enermax magma 120mm fans
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    Default Re: need help with psu for crossfire

    thanks for the replys and i got my other 7850 today so i put in and got around 35 fps more in bf4 and watch dogs got 25 more so wasnt bad for 40 what i paid for it and its the xfx double fan but had to oc to my stock vtx3d which is 1000/ 1225 factory im thinking about selling both but not sure what card to get

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