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post #21 of 58
heres a place that sells extenders of all different kinds although beyond that idk just found them on google

http://www.adexelec.com/pciexp.htm
post #22 of 58
Quote:
Originally Posted by ivesceneenough View Post
giving he isnt paying for power.....


how long would it take to recoop something like that?


(i realize hard numbers are not possible, i just want some speculation )
assuming that 5970s cost like 400 each, you could pay them off in just under a month

@op. 5970s are just 2 downclocked 5870s, so if you overclock them (which ATi designed them to do), they will perform the same
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post #23 of 58
Thread Starter 
Quote:
Originally Posted by ivesceneenough View Post
giving he isnt paying for power.....


how long would it take to recoop something like that?


(i realize hard numbers are not possible, i just want some speculation )
If the whole setup costs about $3,500-$4,000, then my current estimate is about 40-45 days...
    
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post #24 of 58
Thread Starter 
Quote:
Originally Posted by reflex99 View Post
assuming that 5970s cost like 400 each, you could pay them off in just under a month

@op. 5970s are just 2 downclocked 5870s, so if you overclock them (which ATi designed them to do), they will perform the same
Where does one get 5970s for $400 each? I thought they were a lot more...
    
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post #25 of 58
Quote:
Originally Posted by Muhahahaha View Post
Wait... so this guy has 6 dual core cards for a total of 12 GPUs? I thought the limit was 8 GPUs for some reason. What's the max and how do I do it?
No idea. It's just something I saw that made me need a lie down in the snow.
post #26 of 58
Thread Starter 

Hey guys, so I've decided to go with 4 x ATI 5970s instead. Here's the build I've come up with so far (aside from the video cards, which will be bought elsewhere):


Grand Total = $722.61 (Including shipping of $21.23, but not including video cards.)

As it turns out, the latest Antec Nine Hundred case has 8 expansion slots, but the latest Antec Twelve Hundred case only has 7 expansion slots for some strange reason... Anyway, I believe that 4 x ATI 5970 cards should fit, but please let me know if you've had a different experience.

Also, please note that the only computational power that matters here are the GPUs. A single core Sempron and 1 GB of DDR3 RAM are plenty to "feed" the video cards for this particular project, so I'm cutting as many unnecessary costs as possible.

My main concern here is, how much electrical power do I need? I actually watched a video of someone powering such a system with just 1200W on YouTube:


Is that reasonable? If not, I'll either have to spend a crap load on a 1500W power supply, or buy two separate power supplies and have the second one floating around somewhere... Either way, it won't be very fun.

The main goal is to have at least 4 of these cards running somewhere somehow. If this doesn't really work, then perhaps I'll be stuck with only 2-3 cards per rig...
    
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post #27 of 58
6990s will run faster than 5970s, so why not get them? Also, you do know a normal circuit can only give 1200W max right? You'd have to have a special wiring to pull more.
    
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post #28 of 58
Thread Starter 
Quote:
Originally Posted by Anthraxinsoup View Post
6990s will run faster than 5970s, so why not get them? Also, you do know a normal circuit can only give 1200W max right? You'd have to have a special wiring to pull more.
Cuz I can get used 5970s for about $400 each. And the 6990s aren't very much faster (if at all, for this particular application).
    
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post #29 of 58
Quote:
Originally Posted by Anthraxinsoup View Post
6990s will run faster than 5970s, so why not get them? Also, you do know a normal circuit can only give 1200W max right? You'd have to have a special wiring to pull more.
Where do you get 1200w from?

Household standard is supposed to be 120volt x 20Amp= 2400watt

Now many houses have crap wiring like mine where I only see ~110 Volt at 15amp still gives me 1650watts.

To OP
If you do go with dual PSU's be sure to put them on separate breakers so they don't trip each other on power up. If you go with a 1500watt or so be sure to find yourself a dedicated breaker so somebody else in your lab doesn't decide to use your rigs power.

or

Since your in an office try to find a 220/240Volt breaker and break it down to 110/120 and have plenty of power. or get a power supply that likes 240. I know other places on the planet use it more than the US does.
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post #30 of 58
You don't want to put 4 5970's in a 902. Definitely look for a bigger case.
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