Top of the GeForce 7950 GX2 card
Bottom of the card
At an angle, you can see the 2nd PCB
At first glance, the GeForce 7950 GX2 looks like one card with one GPU and one heatsink/fan unit at some angles, particularly when looking at the card from directly above. Tilt the board a few degrees though and youíll quickly see a second PCB lying underneath the first PCB, complete with its own GPU and heatsink/fan unit, 512MB of memory, as well as the underlying x16 PCI Express graphics interface.
Each heatsink/fan unit is rather slim, a little larger than the reference cooler used on the GeForce 7900 GT basically, being a single-slot design. The two PCBs are then grafted together, so one GeForce 7950 GX2 will take up two slots in your system. The PCI Express graphics slot sitting directly above the card, as well as the slot directly adjacent to your graphics card. This is the same setup NVIDIA used previously on their GeForce 7900 GX2 Quad SLI card.
|GeForce 79XX Specifications|
|GeForce 7950 GX2||GeForce 7900 GTX||GeForce 7900
|Core Clock Speed (Vertex,
|Memory Interface||256-bit per
Onboard||512MB per GPU 1GB total||512MB||256MB|
While the GeForce 7950 GX2 sports a new name, technically the new card is quite similar to its predecessor: no changes are made to the GPU itself. NVIDIA outfits the GeForce 7950 GX2 with two GPUs derived on their 90-nm G71 graphics core. Housed inside the GPU are 24 pixel shaders and 8 vertex shading units, just like the GeForce 7900 GT or GTX, the GeForce 7900 GX2 and 7950 GX2 also run at the same clock speeds: 500MHz on the graphics core and 600MHz for the memory. This is considerably slower than the speeds of 650MHz core/800MHz memory found in the GeForce 7900 GTX, actually placing the GeForce 7950 GX2 closer to the GeForce 7900 GTís speeds of 470MHz core/660MHz memory. This means that a single GeForce 7950 GX2 card wonít match the performance of a pair of 7900 GTX cards running in SLI, but should definitely be faster than a single GeForce 7900 GTX.
Since the 7950 GX2 and 7900 GX2 share similar clock speeds, performance between the two boards is the same in a single-card configuration.
Instead of performance, the key difference between the GeForce 7950 GX2 and the GeForce 7900 GX2 lies in the boardís design; weighing in at just 9Ē long, the GeForce 7950 GX2 is considerably shorter than the GeForce 7900 GX2 board it replaces. This makes the card easier to fit in most cases, not to mention more breathing room for installing other devices such as hard drives. The original GeForce 7900 GX2 board was so long that it could get in the way of these devices.
Note the size difference between the 7900 GX2 and 7950 GX2
Only one 6-pin power connector on the 7950 GX2
SLI bridge connection on 7950 GX2
But the changes donít stop there, as NVIDIA has also removed one of the SLI bridge connectors on the GeForce 7950 GX2, as well as one of the 6-pin PCI Express power connectors on the board. Previously the GeForce 7900 GX2 required two 6-pin power connections to run properly, meaning you needed four different power cables to run Quad SLI! This extra cabling takes up even more space in your case, and of course requires you to run additional power cables to your graphics cards.