Ok I don't have these cards but maybe I can help. Do you have these cards together in the box? I know putting in some PCI risers will help to get them out of the box. www.amazon.com/s/ref=nb_sb_noss_1/185-3758839-3464333?url=search-alias%3Daps&field-keywords=pci+risers for example. Here's a video I found that kinda shows what I mean. not the greatest video though. just happens to be a 7870 and a R9 270. Looks like he uses two PSU's and a dummy plug They will run very hot I know, but yeah that does seem a little too hot. Heat is your worst enemy.
You could try this for the 7870: gpu engine at 925, mem clock 1375, 1 gpu thread, intensity 19, 256 worksize, and 16000 thread concurrency I can't seem to find one for the R9 270 but you can look on here if you haven't already litecoin.info/Mining_hardware_comparison
But them risers should help get them some air and make things a little cooler. Put some big fans on them as well. Hope this helps some.
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Mar 31, 2018 6:33:51 GMT