A 101 on GTX 295 technology
A 101 on GTX 295 technology
Alright, next in line a crash course on what the GTX 295 actually is. Dual-GPU based graphics cards... the past few years we've seen them a couple of times. The previous one released from team green (NVIDIA) was their GeForce 9800 GX2. By itself a pretty interesting card. Though every now and then also haunted by driver issues. This is the reality of any multi-GPU solution really. Rendering a game with multiple graphics processors is increasingly more difficult opposed to using just one GPU.
Now, typically I prefer a single GPU based high-end graphics card over a dual-GPU based solution, that doesn't mean though that things have improved over the years.
The biggest positive for the GTX 295 for example is that it can continue on existing technology; SLI. And it's exactly what is happening inside that GTX 295 graphics card... the two GPUs are internally bridged and actual SLI takes place internally, rendering your games based on profiles in the GeForce drivers, like alternate frame rendering etc.
Now please understand that there are always some snags to Multi-GPU based products though. Typically NVIDIA uses two PCBs which adds more overall cost to the design. This is why the new single PCB version has been released.
Secondly, and that goes for any multi-GPU based system, you can double up everything. This means you now have two GPUs that need to get rid of their heat, which requires extra cooling. You'll need more PSU capacity, you'll need good airflow inside that system. So yeah, not only performance doubles up, everything doubles up. And that also goes for the innards of the graphics card just as well.
So while you might look the GTX 295 as a single card, it's a bit of a weird combo. It has the memory volume and frequency of two GTX 260 cards yet the raw shader processor horsepower of two GeForce GTX 280/285 (GT200) cards.
Memory: 1792 MB (896 MB per GPU)
Shaders processor: 240 per GPU, 480 in total
Core frequency: 576 MHz (Texture and ROP units)
Shader processor: 1242 MHz
Summing it up in one line, the GTX 295 is a hybrid between two GeForce GTX 260 and 280 graphics cards. One thing is a fact though, it's an awful lot of computing power for sure as you will have massive graphics memory and a huge amount of GPU performance as you now have two GT200 GPUs at your service. Each GPU features seven ROP and framebuffer partitions. Each ROP partition contains four ROP units, providing each GPU with 28 ROP units. Each framebuffer partition is connected to 128 MB of memory, totaling 896 MB of video memory for each GPU, thus times two. Total number of Texture Filtering Units: 160 (80x2).
Let's talk about mother nature and your power bill for a second. See, this card has a 289 Watt peak power consumption. That is a lot of power being consumed at game time, which you can frown upon. There are obviously also a couple of very interesting positives.
You are adding a MASSIVE amount of horse power to your PC. Seriously, it's even a little crazy when you think about it. You have 2x 240= 480 shader processor cores inside the graphics card... that's a rather incredible amount of horsepower.
Some GeForce GTX 295 facts.
- Fabricated on a 55nm production node
- Two GTX 200 GPUs
- Accumulated 480 shader processors
- 576 MHz Core Clock frequency
- 1242 MHz Shader domain frequency
- 999 MHz DDR3 Memory frequency
- 2x 896 MB of memory = 1792 MB = 1.8 GB
So in layman's terms this graphics card has the memory configuration of the GTX 260, but the raw shader power of the GTX 280. And these two are then multiplied by a factor of two.
| GeForce 9800 GTX |
GeForce GTX 260 Core 216 |
GeForce GTX 280 |
GeForce GTX 295 | |
| Stream (Shader) Processors | 128 | 216 | 240 | 240x2 |
| Core Clock (MHz) | 675 | 576 | 602 | 576 |
| Shader Clock (MHz) | 1675 | 1242 | 1296 | 1242 |
| Memory Clock (MHz) x2 | 1100 | 999 | 1053 | 999 |
| Memory amount | 512 MB | 896 MB | 1024 MB | 1792 MB |
| Memory Interface | 256-bit | 448-bit | 512-bit | 448-bit x2 |
| HDCP | Yes | Yes | Yes | Yes |
| Two Dual link DVI | Yes | Yes | Yes | Yes |
Some of you might wonder why NVIDIA never decided to use GDDR5 memory on this product, a very valid question. Fact is that the GTX 200 memory controllers simply do not support GDDR5. So expect GDDR5 integration in the next generation GeForce graphics products, launched this year under ASIC name GT300.
Again let me state this very clearly, there is no difference whatsoever when it comes to specifications between the dual-PCB and single PCB versions of the GeForce GTX 295, including clock frequencies on all GPU domains.
