On the surface, I think you've painted yourself into a corner. You have this and that and it won't upgrade that easily. All-in-all you really need a new PC or one more capable of reasonable upgrades. You need to check what your video slot will support and then find one that will fit, install and draw little power. In your case, I really don't see an immediate fix because of the power side of it. If in fact you need what the GPU will want as a bigger PSU and yours is a custom or OEM type(unique) then it all costs more. As for a new GPU(video) card, you need a half-height or low height type which contains your 1gb or better video ram with DDR5 ram or similar and of course provides the resolution you need. I suggest you visit:
http://www.tomshardware.com and see what's available and check pricing
You probably can remove your mtrbd., install a larger typical PC case which allows the generic PSU sizing and then remain within the size as well of GPU cards out there all this w/o special considerations other than being able to re-use your current mtrbd.. I see you PSU as a real problem as well, 200W isn't enough for any demanding GPU out there.
The main problem is that I ignorantly bought a 30" monitor (2560X1600 display). Graphics card can't handle it. The net effect is that the monitor will ONLY run on resolutions at 1280X800 or lower. Anything higher than that gives me gibberish data corruption on the monitor, and this has been confirmed by others who own this monitor. The current 1280X800 setting is ugg-buttly looking.
I blew the budget on this monitor, but now I need to upgrade the video card (needs at least a 1GB with DDR5) at the most reasonable price.
Anyhow, the computer is this one, if you want to look at it. The skinny details are below:
The skinny info on the computer:
Motherboard is a mini-ATX form, GeForce 8200 with internal graphics card built in.
4gb DDR2 ram
AMD Athlon X2 4850e(2.5GHz) (dual-core)</div>
Has one empty PCIE 16X 1.1 slot
220w power supply (has to be replaced obviously).
Main problem: This is a mini-tower, and I don't really have room for much. Also, the power supply is horrible (220 watt) and very difficult to find for this computer at any useful wattage (500W or so).
I have two scenarios that I could possibly do, and I need to do the cheapest possible right now (saving $50 right now is a huge deal, I apologize if that sounds petty lol). I can "do it right" later, so long as I can do it functionally right now, even if the computer tower is an eyesore.
Scenario 1 (the easiest scenario): Find a low-profile graphics card that will fit the slot, and perhaps buy a standard 500W power supply (which won't fit in the slot) and just let the power supply sit outside the machine (we leave the cover open on this machine, we don't care if it's visually ugly). Is there any reason that I could not place externally "any given 500w power supply" that fits the connections on this computer?
Scenario 2 (most arduous, probably most sane): Find a gaming PC box with the power supply already in it. I'm OK with this but it's a LOT more work when I really don't need to move everything if I don't have to. If I do this, will my motherboard support any size video card that is PCIE 16X, or do I still need to look into a low-form factor??