Can my computer handle a EVGA 275 GTX card?

I have a Dell Precision T3400 desktop. I would like to upgrade the graphics card to a EVGA 275 GTX Co op edition card. Upon entering my product service tag number (like a serial number) into dell.com. The upgrades options said my computer can handle a EVGA 260 GTX graphics card. Because the EVGA 260 GTX lookS very similar in size to the 275 GTX I think it would fit in my computer and also work in my computer. Below are some references, pics, links AND SPECS OF pc. I woudl tell you what kind of motherboard I have, however I do not know how.

The case measurements, (from me measuring outiside) are 17 inch height, 17 inch length, and 6 inch wide

1) Please let me know if this graphics card will fit and work in my computer? Will it work with my power supply? I have called Dell and they could not answer this question - pretty pathetic I know.

2) Please let me know what the blue L-shaped plastic piece is on the bottom of the PC. Should I remove it?

3) Also does anyone know how I can get a full losts of the specs/ hardware of my computer? I have Dell.com specs but they seem pretty lacking. Any software that can tell me all my specs, paid or free is fine.

4) If I need a better Power supply please recommend a good one?

Thanks for your help please see below.

inside of my PC

my power supply

graphics card i bought http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5507371&CatId=3775

BELOW ARE THE TWO LINKS TO THE GRAPHICS CARDS DELL.COM SAYS MY COMPUTER CAN TAKE

http://accessories.us.dell.com/sna/products/Graphics_Cards/productdetail.aspx?c=us&l=en&s=bsd&cs=04&sku=A2383034&mfgpid=193795&chassisid=8256

http://accessories.us.dell.com/sna/products/Graphics_Cards/productdetail.aspx?c=us&l=en&s=bsd&cs=04&sku=A2391143&mfgpid=193795&chassisid=8256

T3400

System Type: Dell Precision WorkStation

Ship Date: 4/14/2008

Dell IBU: Americas

Quantity Parts # Part Description

0 01323 INFORMATION..., NO ITEM

1 CR457 Processor, Q6600, 2.4, 8MB, Core Duo Kentsfield, G0

1 DN076 INSTRUCTION..., DEVIATE L6 TO L5.5, 375W

1 5120P Cord, Power, 125V, 6Feet, SJT..., Unshielded

1 YK181 Guide, Product, Information Client, DAO/BCC

0 83535 INFORMATION..., PART, ADVANCED TECHNOLOGY ATTACHMENT PACKET INTERFACE..., DEVICE

1 C831D Kit, Software, Powerdvd, 7.0 Digital Video Disk Drive 7.0-02

1 DJ310 Palmrest, Keyboard, Plastic Entry, Liteon, Board Lock

1 RH659 Keyboard, 104, UNIVERSAL SERIAL BUS..., UNITED STATES..., Black, DARFON ELECTRONICS, CORP...

1 UU971 Assembly, Dvd+/-rw, 16X, Serial Ata, Half Height, Toshiba Samsung Storage Technology

1 J9256 Kit, Cable, NVIDIA..., Video Graphics Adapter, Digital VideoInterface, Lead Free

4 KN992 Dual In-line Memory Module, 1GB800, 128X72, 8, 240, 2RX8

1 RX073 Kit, Software, Overpack, WXPPSP2 Compact Diskette W Documentation, English

1 TW212 Card, Graphics, 256, NVS290, ULGA8

1 WN545 Kit, Software, Adobe Acrobat, 8.1English

1 FC256 Hard Drive, 250G, S2, 7.2K, 8M Lead Free, HIT-VAN

1 YH958 Mouse, Universal Serial Bus 2BTN, Lead Free, Entry, Logitech Black

1 YY660 Kit, Software, MS Office Basic-2K7, English

1 DN004 Assembly, Heatsink, PRFMC Shroud, MATRIX TANK DESKTOP...

1 RW118 ASSEMBLY..., CHASSIS..., PWA INTEGRATED..., 525W, T3400

A GTX 275 requires a minimum of a 600W power supply, you have a 525W power supply. These mid/high range GPUs are HUGE, you may need to remove the blue thing, the black one looks like the CPU cooler.

For an EVGA GTX 275 CO-OP video card you will definitely need a new power supply. The CO-OP edition has a GTX 275 gpu (for graphics) and a GTS 250 gpu (for Physx) on one video card. The extra gpu will only come in handy with games that support Physx. There are only a handful of games that use Physx and only a few of those are considered to be top notch games. Personally, I would recommend a regular GTX 275 or the GTX 260 over the 275 CO-OP edition. That PSU might (just barely) be okay for a normal GTX 275 and more than likely good enough for a GTX 260. Make sure that your PSU has two 6-pin PCIe connectors (or one 6-pin and one 8-pin for the CO-OP edition if you get a new PSU). To be honest, I think it would be better to get a new PSU, because who knows how good that one will perform if it is put under additional stress of supplying power to a graphics card. I have no idea what that blue thing is other than it looks like it is supporting what looks like the cpu heatsink (black thing). Make sure the heatsink is still stable and secured after removing the blue thing before turning your PC back on.