Crossfire on Dell Precision Tx500 series workstation?

That is true. The 1,100 watt T7500 PSU is longer front to back which requires some modifications. May as well get a good aftermarket unit. Besides bending the retaining tabs on case roof flat, you may want to get an EPS extender so you can easily run the wires behind the mainboard.

About CPUs .... you should consider how much hotter the 45-nm Bloomfield and Nehalum chips run. About 15-20 degrees C higher than the 32-nm Westmere under same loads. That alone makes the X5687 a great choice in my book. Can say from experience the latest BIOS is required in both T3500 and T5500 to run the Westmeres. Dell makes it a very simple upgrade.
 

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The T3500 PSU is 500-someodd watt, T5500 is 875w, T7500 is 1100w.

I picked up a T7500 PSU and harness for 35 a few weeks ago... I'll try shoehorning it into my T5500 and let you guys know how it works out w/ pictures when I get home from my business trip.

Additionally, you could pick up a T5500 PSU and harness for your T3500, it's the same exact size. It has 2 8-pin EPS connectors, so you could use this adapter to convert one to 2x8-pin GPU: https://www.ebay.com/itm/EPS-8-PIN-...N-POWER-CABLE-10-MADE-IN-AMERICA/263283697063
 
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System came in and is assembled and running. It came with non ECC memory that was not matched, so I just threw all the extra DDR3 I had into it and brought it to 16gb. Will get 12-16gb of matched ram later. Seller screwed up and sent the wrong box so it actually came with a W3503 but I made him partial refund so I got a W3565 on order ( $8 CPU ), and some more Arctic Silver. Decent amount leftover from what he refunded too.

Scores 2,200 on Heaven with high settings without Tesselation and AA at 1366x768 ( screen resolution of setup tv ) with the W3503 dual core. I'm fairly certian that it will come up quite a bit with the quad core when it comes.. For reference, my T3500 w/ 1060 6gb scores 3,520 with the same settings.. The R9 270X blower cards are close but they don't get hot. With a modified fan profile, they run at under 60*
 
Well, finally got around to sticking the W3565 in and with that and another 2gb of ram, it scored over 3,700 on high and 3,546 on ultra which is a higher score than my X5670/ 1060 6gb. Pushing tessellation and anti aliasing, the 1060 box wins of course due to vram limitations but for $100 and some parts I had laying around the end result is pretty rocking... Also stuck an 80mm fan to the cpu heat sync now.. It's pretty hot and loud, but it's impressive. CPU and GPU temps hold at acceptable levels. GPU's do not get over 65*C
 
W3565 are decent for earlier 1366. Have several. Smaller cache, lower bus speed, and more importantly, they will limit your RAM to 1066 no matter what modules you have. Was amazed how much a X5687 woke up system in my sig. Over 20% jump in Firestrike scores with everything else the same.
 
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Yeah I know.. The ram in the computer is 1066, so it's not limiting anything. If it becomes a limit where the W3565 needs to go away, it's an $8 CPU.
 
Have a server box currently-T5500, running a pair of X5687's and 24 GB.
Have yet to run into anything that really pushes it.
 
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