Hello, I am wanting to buy a graphics card for my Optiplex 755. It has an Intel Core 2 Duo 3.00GHz processor and 2gb of ram. I am wanting to spend about $50-$60. I really only want play Minecraft, WoW, LoLm and TF2. I am hoping to get 60FPS in Minecraft on high settings. My Optiplex is the biggest tower.
From what I can find, the full size tower has a 305W power supply. Does the PSU have a PCIe power cable? The best you can do for a gfx card will probably be one that gets all its power from the PCIe x16 slot alone. But if the PSU has a power cable for the gfx card, you may be able to jump up tier.
I think I have to step in since not so many users know the limitations of Optiplex Mini Tower cases - this is not your typical small ATX case, it is BTX case, and not all video cards can fit, so I will provide you all with small guide into Optiplex MT GPU upgrading.
THIS POST APPLICABLE TO MT (MINI TOWER) FORM FACTOR ONLY.
Unfortunately no card that is more than 7.5 inches long or 2 slots wide will PHYSICALLY FIT inside the case - it was found that only single bracket video card can fit due to BTX MOBO, where card internals facing upward towards PC internals, not ATX, where dual card design is blocking another PCI slot by facing downward.
If you prefer the card with beefier fan, then the length of the card must not exceed 7.5 inches, otherwise only "skinny" single bracket, single slot cards can physically fit.
Pictures below will prove my point.
View shows no room for dual bracket
Single bracket only, or you have to cut dual bracket in half
This is the other way to show my point
Here you can clearly see only single place for the bracket
7.5 inches explained, also shown "obstacles"
This is the picture of actual "skinny" single slot video card (not sure which model)- perfect, "glove" fit.
There is additional problem, which I can not check - there are tall transistors on motherboard (this is Optiplex 745 Mini Tower motherboard)
take a close look at PCIE slot (the one to the right, with blue holder lever), next to the lever you can see 2 black tall transistors, this could be a problem for low sitting card, it was never reported to my knowledge on Optiplex 745 or 755 (similar problem was reported on Optiplex GX620, which has more transistors like this, so it could be not applicable here).
I will list below strongest and largest cards, which can fit, in addition to those, most low profile cards will fit as well, the best in this class is
So, I found 2 GDDR5 7750 cards and one DDR3 4GB (GDDR5 is better than GDDR3, even if GDD3 offers 2 GB RAM or more), which confirmed in reviews to fit Optiplex gx620, 745 and 755 cases (the difference between those models are different processors).