Useless benchmark. I can't wait to get my 27" iMac. I'm going to do the first (and ONLY) review on a 3TB fusion drive talking about drive performance AFTER it's been filled up with well over 128GB of apps and the drive is actually forced to pull up rarely used apps that aren't already sitting on the SSD!!!
Every fusion drive benchmark out there simply puts a few apps on their iMac and runs a test. This is useless because the SSD can hold 128GB. That means if you have less than 128GB of stuff on your hard drive (which happens to be the case with all these benchmarks), it's all gonna be on the SSD. Of course your benchmarks are gonna run fast! It's not pulling anything from the HDD.
They don't actually fill up their computers with 1TB of apps and THEN run the test like I'm going to do. And my test is actually going to run intensive apps that aren't going to be touched in a long time. This will be a true test of the fusion drive performance.
That's actually wise. Even on the MBA, pulling from a 100% flash disk can feel slow (but it might be Mountain Lion that sucks). Switching from Office to Photoshop to XCode to Firefox to Excel to Eclipse -- possibly to EVE if I feel so inclined -- yes, I do that routinely) can feel annoyingly slow.