As someone that favours AMD usually but has both brand gpu's in his current 2 rigs this isn't true, the 6950XT can easily reach 90C+ whilst having insane coil wine - literally look at the angry feedback by customers who have bought them on retailers feedback sections, the Sapphire 7900xt and xtx have been known to get hot and both suffer coil wine even if you buy into the more expensive mid tier of the 3 price options, as for the 4070, mine never even turns it's fan on as it won't ever get to 65c as it undervolts like crazy and even stock it never came on even with the dual bios set to performance mode on the switch at native 1440p max settings in games... It's also worth noting that when side by side with my mates 6800xt when playing the same game at the same native res/settings his 6800xt was using 11.5-12gb vram out of it's 16gb whilst my 4070 was using 9.3-9.7gb or quite often less...
I'll repeat my point this is native res so no cheating with dlss, so TLDR both cards had the same actual vram remaining free at all times regardless of my 4070 having 4gb less out the box, so games definitely are optimized better for nvidia, wether there's sneaky compression doing this or whatever the case, if you can't see it and it doesn't effect actual gameplay/input response, who cares, both cards will last the same time, but then with dlss3.X onwards and frame gen, the 4070 should last a bit longer/if not guaranty it will when it gets to the point it needs to be enabled to maintain settings/resolution...
And FWIW this test was done on pretty much every game out we both had bar BG3/Diablo4 (as neither of us care for either care), this was done with actual vram usage stats displayed and not based on what the game allocates as that means nothing compared to actual use on the fly...
Oh and you could get a 4070 for £520 last month elsewhere from ocuk (rules state I can't name names) and that was an Asus 1 with 3 year warranty, i.e. my exact card, so that's not much more than a 7800xt and cheaper than a 6800xt was when new, hardly a rip off, hence why I thought I'd try it over the coil wine/furnace spec 6950xt that uses 150w peak more than a 6800xt... I only game at 1440p and like having a cool temp room with a silent system that even including the monitor/speakers uses less than a 6800xt/6950xt would on it's own!
With the money I've saved in 2-3 years on electric (playing 6 hours every night at a horrific KW/H) from not adding an extra 320-350w tdp of a 6950xt to my system+monitor running costs, the 4070 has literally cost me nothing in year 3, vs throwing the same money down the drain with a wattage drinking current or last gen amd card, all whilst I don't have to suffer coil wine/sitting next to a furnace/loud fans. FWIW my ENTIRE SYSTEM uses 260-300w at the wall including the monitor/speakers! That's the same as just powering a 6950xt
So I end up with a FREE gpu in 3 years AND £520 back from the money i'd of spent on extra electric to add a 6800xt/6950/7900xt/xtx to my current setup... Then fit the 4070 to the 2nd rig or sell it. Use the bonus elecy money towards a new gpu. Free GPU for 3 years. No brainer.
So yes both teams have dropped the ball in their own ways.
I guess that's the difference with believing clickbait videos/graphs online vs actually trying something yourself and returning it no questions asked under the 14 day no quibble everyone offers, after all why would I let some muppet on youtube deligate my money/opinion when I can send it back next day delivery and only loose what £5-8 in returns postage, and an hour of my time trying out the gpu with my games/installing a driver?
All of that is at best subjective, this thing runs at over 70c, while that doesn't seem too bad bare in mind that its fans are running at over 1800 RPM, its over 36db, one of the loudest GPU's you can get these days, its £560.
Coil wine as nothing to do with the GPU, quite often that's actually caused by the PSU, not the GPU but even when it is that's the coils making that noise, nothing to do with the GPU, all cards be it AMD or Nvidia can suffer coil wine, there are plenty of Nvidia examples that have it and plenty of AMD examples that don't.
This is the cheapest RX 7700XT, like the £560 4070 i linked its got an inexpensive dual fan cooler, its £430, 90% the performance of the 4070 and overclocks 18% 'performance' according to TPU (which OC vs OC makes it as fast if not faster than the 4070) 61c at 26.3db, a huge difference. Its a far higher quality product despite being £130 cheaper. that 4070 is cheap junk for silly money, no one should be buying it, isn't that what tech jurnoes like to say these days?
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. Currently playing CP2077 near max settings. Benchmark is giving me 118 with FSR(rig in sig) on a 5800x3D with no SMT so just 8 pure cores and power locked on linux. I think I'm well off for the foreseeable future. But you are correct in "different needs and priorities for different people".