The Redline are DDR500 with 2-2-2 timings, but very high 3.3V-3.5V voltage. They also require active cooling. What's the deal with that?
because the mushkin are for extreme enthusiasts muchlike the OCZ VX (Voltage XTREME) series.....they require a lot of voltage but you can get some ridiculously high MHz with tight timings...those G.Skills use Samsung TCCD chips which will generally get higher speeds than the Mushkin Redline which utilizes chips like the BH-5 which LOVE the voltage......TCCD's will get the higher speeds but generally looser timings (Chances are you could get to DDR600 at 2.5-3-3-7 if you used 3v)
It requires active cooling (mushkins) because at 3.2v and above the RAM can get quite warm...a simply 80mm fan blowing above them is enough to cool them so that's all they mean by active.
Given like 3.7v it's not uncommon for those mushkins or the OCZ VX series to hit like 270Mhz (DDR540) with 2-2-2-5 timings....hell guy named SolidNecro over at pimprig did a review on the OCZ CX and with 3.7v his was running 2-2-2-2 timings....
I've also seen some people running 1-2-2-5 timings but that's HIGHLY uncommon