clutchc :
The reference GTX 750 is single slot,
http://media.pcgamer.com/files/2014/02/NVIDIA_GeForce_GTX_750_Class_3qtr.jpg
...but I have not seen a manufacturer offer one yet. They all seem to be 2-slot. The GTX 750 is about the fastest card you can use that doesn't require a 6 pin power connection. It would be ideal for your Dell if it wasn't for the fact that they used that goofy MB design. Is this what you are running into? http://i190.photobucket.com/albums/z80/Gen-Ben/8800GT010.jpg
Yeah, that's like how my motherboard is. I have a GeForce 210 card in it right now (it was in there when I got the computer from someone, I just changed the motherboard from an e510 to an e520, and I changed the power supply to a 500 watt.) But my GeForce 210 is trying to go out on me or something...it keeps having "driver failures" and (but the driver restarts itself "successfully", but I have the same problems for a couple of times a day every day). My husband says that it could be because it's getting really hot (he put his hand near it and could just feel the heat from it.) We took off the side cover off the computer and left it off and added a fan from another computer that doesn't work anymore and I'm still having this problem. I have a huge fan in my power supply (it's facing towards the graphics card), the fan the came with my computer, and an added fan...
Something new that started, though, is that this morning, I started getting system error messages (something about memory...) and Windows 8 brought up a blue screen (not like a normal blue screen) saying something about memory (I don't remember it all), and when the computer restarted, it asked me if I wanted to send an error report to Microsoft and it had 3 files listed that was having problems, one said something about memory dump, and one was just called memory.(can't remember the extension), and the other was just letters and numbers...
I was thinking that it was my graphics card and that's why I was wanting to replace it with the 750. I thought "why not get the best graphics card my computer can handle while I'm at it?" But I don't know if it's really my graphics card or not now...
Oh, and another problem I keep having is that my computer was being VERY laggy. Like if I move the mouse, I had to wait a few seconds for the cursor to move to the spot where I moved it to. I had this problem before, but that was on Windows 7, different hard-drives, different motherboard, and a different power supply...I thought I fixed the problem...now the only suspects left (that I haven't replaced yet) is my graphics card and my wireless card...
The lag on my computer is actually a LOT worse than it was before I replaced everything...But the lag goes away whenever I run CCleaner and turn off the computer and then turn it back on (I don't restart it usually). I know my wireless card has troubles sometimes (like saying I don't have internet when I know I do, because it was doing that while I had a laptop streaming live TV from Time Warner Cable...so I know my card has issues every now and then...) I bought a refurbished (cheap) wireless card because my parents wouldn't let me put an ethernet cable in my room (from the living room to my room) and I needed internet access to be able to do surveys to get what I needed for my computer.
I've literally replaced everything in my computer except for my graphics card and wireless card...I don't know what else to do except replace the graphics card and hope that fixes my problem.
EDIT: I forgot to mention that I have 4 GB of RAM and a Pentium D 945 (3.4 Dual-Core) processor...