Is r9 295x2 running at x16 or two x8?

[Wilson Yu]

So I just built a gaming rig using a gigabyte ud5h z97 mobo and a r9 295x2. But I am not sure is my gpu running at x16, it's single gpu plunged in a pice x16. Or two x8, since the 295x2 are two 290x in one card. And what if I add another 290x into my system, assuming my PSU and CPU are compatible with trifire, will that 290x be running at 4x plunged into a pcie x8 slot or x8?

Here is my mobo specs:
www.gigabyte.com/products/product-page.aspx?pid=4950#sp

 

[drixkarasu]

The R9 295x2 has two chips, but it is connected to a single PCI-e x16 lane running at x16.
If you added a r9 290x both cards would run at x8.

 

[i7Baby]

It will want to run in a x16 slot.

Crossfire compatibility - http://support.amd.com/en-us/kb-articles/Pages/Crossfire-Chart.aspx 295 and 290x don't go together.

 

[Wilson Yu]

Thanks for your response and can you tell me about how much watt will 295x2 and 290 trifire draw.

 

[drixkarasu]

They will draw about 750-800watts and that is just the GPUs, you need a solid 1200+watts PSU at least to use them.

Check this benchmark to see if it's worth doing it.
http://www.digitalstorm.com/unlocked/amd-radeon-r9-295x2-and-r9-290x-hybrid-crossfire-review-multi-gpu-scaling-idnum251/

 

[Wilson Yu]

I believe I can trifire 295x2 with 290 since 295x2 are basically just two 290 chip in one gpu. I also saw some other builder tried this combo before and works fine, but thanks for your info tho

 

[i7Baby]

As I said - you can't crossfire a r9 295x2 with a r9 290x per that link I posted.

For a r9 295x2, you'll need 1000W PSU.

 

[Wilson Yu]

Thank you drixkarasu, looks like I cannot trifire using my 1050 watt tpg then, since it draws 1059 watt according to your source.

 

[drixkarasu]

@i7Baby
Check this link, you can Crossfire a 295x2 with a 290x even if it's not in AMD's list.
http://www.digitalstorm.com/unlocked/amd-radeon-r9-295x2-and-r9-290x-hybrid-crossfire-review-multi-gpu-scaling-idnum251/
@Wilson Yu
Don't use a 1050watts PSU for a system drawing 1059watts, PSUs are not made to run at 100% load all the time, it would die really fast. You need a good 1200watts PSU at least to run that system.

 

[Wilson Yu]

@drixkarasu
Thanks for your advice, I will plan my next upgrade with your advice!!