I cobbled a AM2 A64x2 4600+ 2.4GHz, 2x2GB DDR2-800, Evo 850 500GB, GTX 970, Win 7x64 setup last night. The nForce 2 mobos all had bad caps, so this is the oldest platform I can safely work with.
General desktop performance is unsurprisingly, fine.
720p60 Youtube on Chrome was borderline watchable, dropped a frame or 2 every second. 1080p60 was a powerpoint slideshow. GTX 970 doesn't do VP9 HW decode.
CS:Source was unplayable even with just 10 bots at 20 fps. IIRC it ran a lot faster back in 2005, so my conjecture is either the GTX 970 drivers are pushing the poor CPU to death or Valve updates over the years had bloated the game up. Will test again with HD7950 / X1950 Pro.
My $20 802.11AC USB adapter got 3x the realput of the pitiful 100mbps onboard LAN.
Cinebench R15: ST = 52, MT = 102. (8700K is only slightly over 2x in IPC)
CPU-Z: ST = 92.1, MT = 182.9
Crysis 32-bit demo very high: 30 FPS (sig rig = 118 FPS)
I also ordered a $9 X2 6000+ on Ebay because why not?
8700K 4.3GHz @ 1.05V | Cryorig H7 | MSI Z370M AC | 32GB Corsair LPX DDR4-3200 | GTX 1070 @ 0.8V | 500GB Evo 850 | 1TB M550 | 3TB Toshiba | Seasonic G650 | Acer XB271HU