I just got another AE-9 the other day. The meaningful differences is like the AE-7, it doesn't need the six pin molex which draws 80 watts from your power supply for the amp in the audio control module like the AE-9. The DAC chip is a good one, the low power version of the 9039Pro which I have...
I just got a 5950x and if it's not running at stock settings it's defective if it's not overheating. I've been on eBay since 2000 and nobody tests things like CPU's, and everyone sells things for a reason. Use the 30 day return window, I've been burned so many times over the years with people...
I just got the 5070 at Walmart for MSRP, and had a 3070 a while back. It's an improvement, but it's not earth shattering. If you sell your card on eBay, it's 15% since they charge their fee on shipping and taxes too. You'll like it, but it's not a mind blowing difference. Dialing back some...
I've got one, the best sound quality is always direct mode. The 5.1 surround would be second best, but with all the effects turned off. It depends on the game sound engine though. Some games it helps with the 5.1 virtual, but others which were made for stereo are most accurate in direct mode...