The chess test was as fast on Windows 7 as on XP on mine, once I disabled all the remote access, remote registry, etc crap (no desire for anyone to access my computer remotely anyways). Prior to lightening up the svchost load, spi and chess were slower. Though I had 64bit not 32bit as well.
Was not cold enough to try 23x200, so I ran just 5 runs of same 23x198. But 2 of 5 runs on 7 beat my second best windows xp run at same speed, and both 9.27 and 9.25 were close to my max 1 in 30 XP runs of 9.298. Windows 7 was running more consistently high though, at least in 5 runs, but may just be coincidence that 7 on average was running faster. I am pretty sure I could get over 9.3 with enough runs on 7, but not going to catch you unless I get 23x200 running.