3

I have two cards GTX 690 (dual core). I did the Sli successfully. Nvidia control panel acknowledges the two cards as quad Sli.

However, the problem is that Windows 7 64-bit Ultimate is showing me the graph memory size as 4 GB while it is supposed to be 8 GB because of the Sli. Also the benchmark from all software is giving me a very low score compared to some other guy's benchmark on YouTube.

It gives me a big headache. Does anyone know why this is happening? If so, how can I get Windows 7 to recognize all 8 GB of memory?

Thanks for your help in advance.

My computer specifications:

(Processor: Intel Core i7-3930k @3.2GHz(12CPUs))---

(Memory: 65536 MB Ram 1866 MHz)--

(OS: Windows 7 Ultimate 64-bit)--

(OCZ 240GB as SSD PCIe drive for booting and storage disk)--

(DirextX version: DirectX 11)--

(VGA Card: 2 X EVGA GTX 690 Dual GPU. Each GPU is 2 GB, so total memory should be 8 GB.)--

(MotherBoard: ASUS Rampage IV Extreme)--

Others with lesser specifications get a 2500 score in heaven benchmark while I get 1501 as if it is one card.

nhinkle
  • 37,661
Moaadh
  • 35

1 Answers1

1

Video RAM with SLI does not stack, it is mirrored so your total will still be 4 GB as each card is only using it's own Buffer. How SLI works (by default, there are other modes) is each card renders a frames independently in an alternating order, so card 1 then card 2 then card 1 and so on. This is also what creates the "micro stutter" that you often hear people complaining about.

Here's the VRAM question on NVidia's SLI FAQ.

Supercereal
  • 8,761