Dell Optiplex 755 CPU and GPU upgrade

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kevinakerberg

kevinakerberg

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Oct 14, 2015
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Hi everyone,
I was looking to upgrade a Dell Optiplex 755 for a friend. I was looking to replace the CPU with a core 2 quad q9550, replacing the ancient radeon card with a r7 360 sapphire nitro 2gb. Also I also was looking to upgrade it to 8gb of ram (4 x 2gb). I was just wondering if the stock PSU would be able to handle this load or if I need to buy a new one. Thanks.
 
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Just google the Dell part#s above and you can find the coolers on Ebay, Amazon, Discount Electronics, Red Planet Trading,Server Supply, Stuart connections, and others. They generally trade for $10-$15. You can also Google them and clicik "images" to see which one you want.
MSI was the vendor with EUFI only cards. Mine is PNY and not EUFI.
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kevinakerberg

kevinakerberg

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Thanks. Will I be able to fit a standard ATX PSU into the case?
 
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william p

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The stock 305W PSU is rated very conservatively. It's rating is continiuos full load. Generally regarded as 350= 375W equivalent. I haven't worked specifically on that model. But usually Dells from that era will accept aftermarket PSU. You might need to push down a couple sheet metal tabs that Dell uses. If the card needs a power connector then that decides it right there. No GPUs are made to fit BTX format. The BTX cooling setup will determine how much interference you encounter.
Wide single slot cards with 1 fan not much longer than the PCIe slot go right in. Long narrow single slot card go in also.
Short 2 slot cards with only a vent on the second slot can be made to work by cutting the bracket to single slot, and cutting the cover to allow air out the side at the rear of the card. ITX cards the same way but require grinding some cooling fins at the front. Long 2 fan cards won't work.
If you don't already have the video card, I would consider the GTX750ti O/C due to it's low power draw (no connector required) and better performance it might save the cost of a PSU upgrade. For a Quad core I suggest a heatpipe cooler. If you shroud has six holes in it spaced in 2 groups of 3 on each side. then D9729 bolts in. If 6 evenly spaced holes then T9303 fits. T9303 is better and you can modify the other cover to fit it now. If you encounter high GPU temps. a small expansion slot "cyclone" blower will clear hot air out from behind the GPU. Be aware that some new video cards may" REQUIRE" EUFI BIOS. I don't know if your computer supports this or not. Check with Dell.
 
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kevinakerberg

kevinakerberg

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Yes, I did some more research and I'm looking at the MSI 750ti low profile. And where would I find a sustainable cooler for the q9550?

 
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william p

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Just google the Dell part#s above and you can find the coolers on Ebay, Amazon, Discount Electronics, Red Planet Trading,Server Supply, Stuart connections, and others. They generally trade for $10-$15. You can also Google them and clicik "images" to see which one you want.
MSI was the vendor with EUFI only cards. Mine is PNY and not EUFI.
 
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william p

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"Low Profile" is for small form factor (SFF) Desktops they have a lower bracket, and the card and fan are lower also. In desktops" Low Profile" means height from horizontal motherboard. A "Low Profile" bracket is about 3" long, Normal bracket is 4 3/4". The entire card and fan will be 3" high also. Measure the slot in the back of your case and you'll see what I mean.
Whwn I refer to a card as being "short" I'm referring to overall length, not the size of the bracket (Low Profile").
"Low Profile" refers to the profile of the computer lying flat on a desk, and also cards made to fit that application.
 
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william p

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There are cards that fit if you measure and shop carefully, and cutting brackets is common. Long thin single slot slot cards fit, Short single slot cards with wide single fan fit. Short 2 slot cards can fit if there's no connector on 2nd slot. Remove bracket, cut in half and re-install. If plastic cover goes all the way to the back trim it so air goes out the side towards the vents in the rear. The computer is a BTX form factor and nothing is made to fit it. There is no reason for a 65W GTX750TI to ever need 2 fans. This is a very common upgrade for these computers.
 
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