Thanks for the data. I ran some more tests just then on the new 331.58 drivers and had much better results when I pushed the memory down a little:
3DMark '11:
180/450: 7079 (max 81C using 331.58 - this seems like an outlier)
200/400: 8364 (max 73C using 331.58)
Will run a test at 230/370 and see how we go. That extra 50MHz on the RAM seems to have made a difference on the core temp (bus speeds, perhaps?) for some reason. Notably it's a slightly cooler morning here as well, so that might be helping (it's hard to control the variables!)
Added:
230/370: 8518 (max 76C using 331.58)
So the 2013 iMac really is benching the same results in 3D Mark 11 as the 2012... Thanks for the results, but I still the 2013 is a "disappointment" after just about a year has gone by.
I was secretly hoping for a GPU bombshell like the 2012 was, but alas...