I just installed a Seagate Momentus XT 500GB Hybrid SSD in this iMac (20") I used Intel's OEM 3.5 to 2.5 adapter, getting it to mount properly with the sata data/power cables was a little challenging but I eventually got it. I put the thermal sensor on the HDD as well, experienced no problems with fan speeds. The only weird thing I noticed is that it no longer chimes, but still boots/works just fine.
+
I just installed a Seagate Momentus XT 500GB Hybrid SSD in this iMac (20") I used Intel's OEM 3.5 to 2.5 adapter, getting it to mount properly with the sata data/power cables was a little challenging but I eventually got it. I put the thermal sensor on the HDD as well, experienced no problems with fan speeds.
I just installed a Seagate Momentus XT 500GB Hybrid SSD in this iMac (20") I used Intel's OEM 3.5 to 2.5 adapter, getting it to mount properly with the sata data/power cables was a little challenging but I eventually got it. I put the thermal sensor on the HDD as well, experienced no problems with fan speeds. The only weird thing I noticed is that it no longer chimes, but still boots/works just fine.