Apple are STILL skimping on the GPU... despite Steam and other gaming platforms becoming more popular on Mac.
The 4670 is more than a generation old, and was an $80 GPU at the end of 2008. My 4890 in my self-built PC is at least 4x as fast in real world gaming, and is also almost 2 years old.
The 5670 is a little better (at least it's current gen) but it's still from the bargain bucket. Even the Mac Pro only has a 5770, which would lose in almost any (DX10/DX9) benchmark against my 2 year old 4890.
I understand the iMac is not supposed to be a high-end gaming rig and that heat could be an issue with really high end GPUs, but there needs to be a middle ground. I'd love to throw all in with an iMac and lose my PC tower, but GPU performance is important to me and Apple have ignored it, yet again.
Quote:
Originally Posted by
Programmer 
It seems pretty clear that they went 5750 to save nearly 20W in the thermal profile. It's a decent step up from the previous iMac and you are
never going to see the highest end gpu or CPU in an iMac or a laptop. The 5750 delivers 90% of 5770's performance at <85% of it's power profile and is a good tradeoff.
The 5750 is a good GPU, but Apple plonked it into a machine that sports a 2560 x 1440 display, so it's going to choke. A 5770 will stuggle at that resolution, let alone a 5750 which has 10% fewer texture units and slower memory clock (meaning lower fill rate).