I successfully installed a 3.06Ghz SLGEA E8435 in my early 2008 24" iMac, which is listed as the processor for the March 2009 iMac. The specifications are identical, excepting that the TDP (Thermal Design Power) is listed as 11 watts lower than the 3.06Ghz SLAQD E8435 (44W rather than 55W). See http://en.wikipedia.org/wiki/Thermal_design_power for specifications. The presumed benefit of the SLGEA version is lower heat generation. Also, the cost was about half that of the SLAQD version, perhaps due to less demand. No problems with heat or operation. I also installed a 2TB Toshiba disc drive, a 960GB Crucial SSD (replaced the optical drive per directions on this site), upgraded to the GeForce 8800 GS video card, and am using a second monitor (24 inch Apple Cinema display connected using a Kanex adapter). I combined the disc drive and SSD into a fusion drive, which works fairly well. The graphics card, though it is fast when working, increases the heat, and has been subject to failure (2 cards have failed so far). The first was a refurbished card from an ebay seller, the second is advertised by MacPalace as Apple refurbished. I bought the warranty from MacPalace, and am waiting on my replacement card. I also installed Macs Fan Control after the first card failed, which may be used to regulate fan speed based on the temperature of a user specified sensor. Without the fan control the graphics card sensor has reached temperatures of nearly 80 degrees Celsius under graphics intensive operations. With the fan control the temperature stabilizes at 64 degrees Celsius under graphics intensive operations, and though the fan is operating at speeds of up to 3200 rpm, the added noise is bearable. Under normal operations the temperature stabilizes at 59 degrees Celsius with the fan control. Note that using the same setup with the original ATI Radeon graphics card results in maximum graphic card sensor temperatures of 59 degrees Celsius, with normal operation at about 40 degrees Celsius. Note that all stated operating temperatures are reduced if the second monitor is disconnected.