As Ubersonic stated:
'As for your friends they were lucky, simple as, many AMD users don't have issues but most people who have issues are AMD users. Back in MoP The were widely documented issues with the HD7900 series in WoW causing system lockups (sound would continue working but system would become unresponsive) which took AMD over a year to fix (and to this day they have never acknowledged the issue).'
^
I know another mate who had an HD6950 which he replaced with an R9 280X who plays BOTH WoW and D3(but I have not played with) who said he no problems with it either.
So looking at what my mates and I had:
1.) I ran WoW and D3 on both an HD5850 and GTX660 and had no problems
2.)Mate an HD6870 which he broke and I found a good deal on a GTX650TI Boost 2GB for him and he had no problems with either in WoW and D3
3.)Another mate had an HD5770 which was replaced by an R9 280 and has had no problems with either in both games
4.)Mate had an HD5850 which was replaced by an HD7870XT and has had no problems with either
6,)Other mate had an HD4830 which was replaced by an HD7850 and no problems with either.
All of them have been playing for years.
Yes Nvidia does run it a bit better in pure framerates,but not enough from what I say to make it as much a difference as the CPU does.
But hey the consensus is that they MUST be having problems though right??
290X here and intel i5 3750k @4.5 and zero problems with WoW and run at 120 FPS pretty much all the time only see small drops in built up areas but nothing major not seen sub 100FPS yet. Btw this is running DX11 as well not DX9 so maybe this is the problem as i got problems where i was getting 45-60 ish FPS with DX9 which was weird and probably just a CPU bottleneck with 1 core.
Also like to mention i'm on the Latest drivers (14.12 omega)
He has no issue.
I ran WoW on ATI 2900XT, 3850, 3870, 4850, 4870, 5850 and 6870. Never had any problem.
Perhaps Error 40?
Neither does that person.
None of them have been lucky - they installed their cards,installed the drivers and played the game.
Ubersonic is still bitter about some issue he had years ago with his card,so meh. Just because he had issues everyone else who uses AMD cards for Blizzard games must instantly have issues too.
I bet if it were a Nvidia card having issues,people would not be saying "upgrade to AMD" but trying to suggest software fixes or other fixes!
Looking at the people in their guilds,I see a mixture of people with AMD and Nvidia cards and I don't see anyone of them having issues.
So at the moment you don't even say what issues you have,let alone what OTHER hardware you are using.
Just one thing I want to add to this:
It might be CPU related. I play WoW, raiding 25+ people HC and 20 man Mythic. I have FPS issues in some parts of raids with 20+ people raiding. Especially on fights in tight enclosed spaces. My step up from a GTX 670 to a GTX 970 hasn't given me much on ultra settings, or indeed on fair/good settings.
I run the game at ultra outside of raids, and fair/good inside. My FPS in raids can be really bad (mid 20s, which doesn't feel smooth) in high intensity fights. WoW can be intensive. People just don't like to admit it. Guys in my guild have 4790ks and 980s, and seem to have way better performance in raids than I get on my i7-920.
Also showing my support for EVGA. And if you don't like your 970, you can use the step-up program. The 5 year warranty (up from 3) is a massive bonus currently too.
He hits right on the head.
EVERY one of my mates and people in their guilds they have been in have benefited more from CPU upgrades than anything else.
Even though WoD is more GPU focussed than before,WoW really taxes only two threads(and part of a third one).
Its the same with games like PS2 which I play a lot - I am still CPU limited with a Xeon E3 1230 V2 set to 3.7GHZ,even when I drop the resolution - I still can get issues doing massive firefights.