Meanwhile, granddaddy T7500 (pictured; starts at $1,800) boasts 192GB of three-channel DDR3 ECC memory up to 1066 or 1333MHz, dual native Gen 2 PCIe graphics slots and supports NVIDIA SLI technology.

Either is fine - personally, I would go with the z800 just because it feels like a more sturdy design. As HellDiver noted, the T7500 is a hell of a big box of air, and it feels slightly cheap.

Dell Inc. announced on Tuesday a new PC that, among its other impressive specs, can be upgraded to sport as much as 192GB of ultrafast DDR3 RAM. The Precision T7500 sports 12 memory slots, each of ...

Dell Precision T7500 — The most powerful Dell workstation offers with outstanding performance and scalability, up to two quad-core processors, up to 192GB of three-channel DDR3 ECC memory up to 1066 ...

The ATI FirePro V7800, ATI FirePro V5800, and ATI FirePro V4800 cards are available on a number of Dell Precision Workstations including models from the R5400, T1500, T3500, T5500, and T7500 lines.