Low power graphics to replace AMD5670

Hi,

So here's the thing. I'm currently running a Core i5 750 and AMD 5670 with 4GB RAM and a 1TB Samsung Spinpoint F3 inside this case:

http://www.dabs.com/products/antec-nsk-1380-uk-black-matx-cube-350w-psu-4V4G.html

I'd like to upgrade the graphics card to something a bit more powerful, but the power supply is only 350W and there is no dedicated PCIe power cable (I'd have to use a molex adapter). The power supply is proprietary so not much chance of swapping it out for a bigger one.

There's a reasonably amount of room inside, so I could move to a dual slot card (although ideally a dual slot card that blows out the back) - the only really constraint is power.

What's the 'most powerful' card I could be looking at given my 350W limit? Could I get away with an AMD6850 even though in most cases a 450W power supply is recommended? What about adding another 5670 for crossfire? I think this is a possibility as I have 2x 16x slots on the motherboard, and it's stated to be crossfire compatible.

Any thoughts / recommendations gratefully received!

Chris
13 answers Last reply
More about power graphics replace amd5670
  1. what does it say on the side of the PSU, whats its amp rating on under the +12V rail?
  2. Antec is a good brand for PSUs so there's a good chance a 350w by them can handle up to an HD5770/6770. The link says its a custom PSU for that case specifically so I can't find info on the output of the +12v rail(s) which is the important rating. This info is usually on a chart on the side of the PSU. If you could check for such a chart and if it gives amperage or combined wattage for the +12v that would help determine what cards you can use.
  3. That's useful thanks. I'll have a look at the PSU later to see if I can determine the output of the +12v rail (I'm betting there's only one, but you never know).

    Chris
  4. chrisjoewood said:
    That's useful thanks. I'll have a look at the PSU later to see if I can determine the output of the +12v rail (I'm betting there's only one, but you never know).

    Chris


    look on the sticker on the side of your PSU, it should look something like this:


    for example the PSU in this picture has 30A on the +12V.
  5. pepe2907 said:
    .


    lol what?
  6. sorry, it was a mistake, a comment not for this theme :)
  7. OK, I've checked my PSU.

    There are two 12v rails: +12V1 with max load 18A and +12V2 with max load 18A.

    The PSU also says that the combined max +12V output is 300W.

    Does this mean that in theory I could run a graphics card requiring up to 18 x 12 = 216W of power? Or am I completely misunderstanding how this works?

    I suppose I'd need to leave some headroom, but based on those numbers I don't see why I couldn't run an AMD6850. Someone enlighten me please!

    Thanks,

    Chris
  8. The PSU needs to run the entire system, not just the video card. The max output on the +12v rails is what matters. The best card I would probably use on that PSU is the HD5770/6770. The HD6850 would probably work but it would be pushing thing to the limit which is never a good idea and can shorten the lifespan of the PSU as well as lower its efficiency. Seems like it might be difficult to replace as well. The HD5770/6770 will be a nice upgrade though. Almost twice as fast as your HD5670.
  9. This is a good deal with the promo code/free shipping/rebate;
    http://www.newegg.com/Product/Product.aspx?Item=N82E16814102941
    Or this one is more expensive but it comes with 2 games(you can ebay em if you aren't interested) and has a closed cooling like you said you wanted;
    http://www.newegg.com/Product/Product.aspx?Item=N82E16814161378
  10. I see - thanks for the advice. I'll probably look at the HD6770. I'm in the UK so newegg isn't much good to me - I'll have a shop around on dabs, ebuyer etc.

    Thanks again,

    Chris
  11. chrisjoewood said:
    I see - thanks for the advice. I'll probably look at the HD6770. I'm in the UK so newegg isn't much good to me - I'll have a shop around on dabs, ebuyer etc.

    Thanks again,

    Chris


    you might like this:
    http://www.dabs.com/products/ocz-technology-stealthxstream-ii-500w-power-supply-6ZZ1.html?refs=50121

    its a great PSU AND its modular too! (better airflow/better cable management)!
  12. ps3hacker12 said:
    you might like this:
    http://www.dabs.com/products/ocz-technology-stealthxstream-ii-500w-power-supply-6ZZ1.html?refs=50121

    its a great PSU AND its modular too! (better airflow/better cable management)!

    His case uses a PSU with a proprietary form factor. It isn't really replaceable.
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