need graphics card recommendation for HP 6200 Pro, Model #B2C78UT

You are going to have problems.

Your power supply is only 320 watts.  Here are the cards that HP recommends for your machine http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c03058610-1&sp4ts.oid=5037949

Roughly these are about 20-40 watt cards (can't be more accurate than that without a lot of Googling and time which I can't do at present).  You'd probably get a card with about 512 Mb of RAM but I wouldn't go higher than that for safety.

This case should hold a larger power supply though, shouldn't it?  If I upgrade that, then what would you recommend?

First, I would recommend that you upgrade the power supply in that machine. 320W is quite low.
But, I was able to find a nVidia Quadro workstation graphics card that only consumes 60W. It is not the high-end of the Quadro line, but it is less than $500 and should fit in your HP 6200.

I certainly hope that your HP 6200 is NOT the Small Form Factor model. Otherwise, you will be hard-pressed to find a graphics card with the performance you desire that will fit in that tiny box. If you have the mini/micro tower, you should be fine.

According to: http://www8.hp.com/h20195/v2/GetDocument.aspx?docname=c04123261 (Specs for HP 6200), the tower version can support full-height PCI Express 2.0 graphics cards with a maximum power consumption of 75W.

So, this PNY Quadro K2200 VCQK2200-PB 4GB 128-bit GDDR5 PCI Express 2.0 x16 Workstation Video Card should work.

Since the HP 6200 is a few years old, you are going to have to ensure that your BIOS is flashed to the most up-to-date, prior to installing the new card. Even then, I can't guarantee that it will be compatible, but I have done this legwork for you and if you keep the receipt, at least if it doesn't work in your HP 6200, you can return it (Or replace that machine with an upgrade -- even better!)

Newegg has the card for $429

http://www.newegg.com/Product/Product.aspx?Item=N82E16814133559

Thanks Daniel.  Yes, it's the microtower.  That's the only reason that I was even looking at a video card instead of replacing the system.  I'll give it a look.  Sounds workable.  Thanks again.

Dow

Got it.  Thanks again.

You are welcome. Best of luck!

FYI, here is the datasheet on the Quadro K2200

http://international.download.nvidia.com/quadro/product-literature/data-sheets/DS-NV-Quadro-K2200-JUL24-US-NV-r-HR.pdf

Gracias!

you can calculate the power you will need with  : http://extreme.outervision.com/psucalculatorlite.jsp

Thanks so much for your help.  The upgraded power supply was a great idea.  However, HP uses a proprietary power supply on this model, so a larger one wasn't possible.  We've ordered a new pc with the horsepower and graphics capabilities needed for our mapping software.  This pc will be reassigned to another user.

Thanks again for all of your help.