Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
As long as it's the same GPU and same amount of VRAM, then it doesn't matter which manufacturer you use and it doesn't matter what the clock speeds are nor what the cooling solution is like.