Well I have something even better from here
http://en.community.dell.com/support-forums/desktop/f/3514/t/19329296.aspx?PageIndex=4
Intel® Pentium® D Processor 960
(4M Cache, 3.60 GHz, 800 MHz FSB) 130 W
Intel® Pentium® D Processor 950
(4M Cache, 3.40 GHz, 800 MHz FSB) 130 W
Intel® Pentium® D Processor 945
(4M Cache, 3.40 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 940
(4M Cache, 3.20 GHz, 800 MHz FSB) 130 W
Intel® Pentium® D Processor 935
(4M Cache, 3.20 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 930
(4M Cache, 3.00 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 925
(4M Cache, 3.00 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 920
(4M Cache, 2.80 GHz, 800 MHz FSB) 095 W
Intel® Pentium® D Processor 915
(4M Cache, 2.80 GHz, 800 MHz FSB) 095 W
Select Intel® Pentium® D Processor 840
(2M Cache, 3.20 GHz, 800 MHz FSB) 130 W
Select Intel® Pentium® D Processor 830
(2M Cache, 3.00 GHz, 800 MHz FSB) 130 W
Select Intel® Pentium® D Processor 820
(2M Cache, 2.80 GHz, 800 MHz FSB) 095 W
Select Intel® Pentium® D Processor 805
(2M Cache, 2.66 GHz, 533 MHz FSB) 095 W
And this is mandatory reading to upgrade to D960
http://en.community.dell.com/support-forums/desktop/f/3514/p/18593269/18716255.aspx#18716255
Next I am planning to discuss all video card upgrades
Optiplex Mini Tower case - 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
Here you can clearly see only single place for the bracket
Visual explanation
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.
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).
Skinny, flimsier in terms of construction, completely single slot XFX 7750
http://www.amazon.com/XFX-DisplayPort-PCI-Express-FX775AZNP4-FX-775A-ZNP4/dp/B007Z3T5JC
A bit beefier cooler, not as skinny, more durable in construction PowerColor AX7750
http://www.amazon.com/PowerColor-AX7750-1GBD5-DH-Video-Graphics/dp/B00775OC28/ref=sr_1_1?ie=UTF8&qid=1362783129&sr=8-1&keywords=AX7750+1GBD5-DH
If you need Video card for working with high resolutions,
BUT NOT FOR GAMING, PowerColor AX7750 4GBK3-H Radeon HD 7750 4GB is
DDR3 card with huge 4GB memory, but is is not as fast as DDR5 and loosing in games
http://www.newegg.com/Product/Product.aspx?Item=N82E16814131486&Tpk=7750&IsVirtualParent=1
Here is review of this card http://news.softpedia.com/news/PowerColor-Launches-Single-Slot-Radeon-HD-7750-4-GB-Video-Card-292712.shtml so this one is not for gamers!
I cannot say which one of those 2 DDR5 is better, both are good and got less bad reviews related to structural build.
I saw recent recommendation regarding drivers "Changing to the just-released AMD catalyst 13.2 BETA driver improved performance noticeably in just about every game" posted 03/05/2013. So older drivers are worse, can not comment about the newer ones, so this part is take it or leave it.
Next will follow maximum possible upgrade, 7750 is weaker...
So far I found only 2 7770 video cards which will fit inside - PowerColor AX7770
http://www.newegg.com/Product/Product.aspx?Item=N82E16814131477
HIS H777FN1G Radeon HD 7770 very tight fit, almost touching heatsink
http://www.newegg.com/Product/Product.aspx?Item=N82E16814187200
From NVIDIA I see SPARKLE 700025 (SX650TI1024KD) GeForce GTX 650 Ti
http://www.newegg.com/Product/Product.aspx?Item=N82E16814187200
7750 cards do not require power supply upgrade, 650 TI and 7770 are.
Yes your power supply can be upgraded, however in the first choice it is 400 watt of unknown manufacturer adapted to fit GX620 and plenty more similar Dell PCs
Here we go, first choice at Amazon you can get this PSU with all connectors, I think
http://www.amazon.com/ATXPowerSupplies-com-HP-Q2828F3P-PS-5281-3DFS-PS-5281-3DF-PS-5281-5DF-LF/dp/B006AVNVU4
Or you can get directly from manufaturer website, in this case you can choose which connectors you need, there is drop down menu where you can choose components, look a bit complicated, but I think it is better than Amazon
http://www.atxpowersupplies.com/350-Watt-Dell-F5114-Power-Supply-F5114-350W.php
So, what is going on above - standard PSU is fitted with metal plate which has mounting holes adapted to be used in GX620.
Now, I proceed to choice 2, adapting regular ATX PSU to GX620, this is hack job - you would have to do some modifications to fit this PSU, reward is 500 watt, maybe stronger can be used as well from the same PSU family line.
One person adapted Antec earthwatts EA500 to GX620 those are the links, first newegg, which is disactivated, but it contains good specs
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371007
Next is Amazon, here I provide all possible choices, in case if one will be sold out, the other one will stay
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Antec%20earthwatts%20EA500
Now the interesting part is comes from this post
http://en.community.dell.com/what-do-i-buy/for_enterprise/f/4516/t/18044042.aspx?PageIndex=2
I just completed the power supply upgrade using an Anted EA-500. [he meant Antec]
The purpose was to provide power and especially the 6 pin molex connector for an nVidia Quadro FX 3450 graphics card. The Optiplex GX620 Mini Tower is up and running with no serious problems. However, I had to make two modifications to allow the new PSU to fit.
1. The chassis has three metal tabs that are designed to hook into and stabilize the Dell PSU. When the locking tab is depressed and the PSU slid away from the opening about an inch, these disengage. Since the new power supply had no slots, the least destructive and quickest solution seemed to be just to bend the tabs back out of the way. I accomplished that by pushing hard with a screwdriver. If need be, they could be returned to position.
2. One end of the power cord receptacle on the new PSU hit the edge of the chassis opening on the back of the computer. In that position, it would have been impossible to refasten most of the screws. I was able to remove one screw from the power recep. and cut off the plastic ear that was in the way.
With those changes, the power supply bolted up securely with all four screws and fit acceptably.
Bill
Little edition.
HOWEVER
The SATA power cables are right angle.
You may need to get a Right Angle SATA Power connector for the hard drives.
Otherwise you can shear them off closing the cover.
Micro Center - Athena Power 6" SATA 15-pin Power Y-Splitter Cable
Serial ATA SATA Power to 2x Right-Angle SATA Power Extension
I think I covered all.
So, conclusion. Without upgrading power supply you can easy go up to 7750 card and with upgrading PSU to second option (above) you can do 650 TI or 7770.
When choosing PSU follow this guide
http://www.eggxpert.com/forums/thread/323050.aspx
I hope I answered your questions.
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