Greetings to all!
I've been lurking around the site and forums here for a long time since I'm content on finding out things myself, but I've finally found something that has truly stumped me! I'm looking into a new system to replace my big Core 2 Quad Q9400 build with similar or better performance, but with lower idle power draw (because the current build draws 95W on an Earthwatts 380D... and it was 115W on the previous Corsair HX620W!).
I've been flip-flopping between an i5-661 and an i5-750. Obviously the 661 will idle much less due to integrated graphics, however I intend to use a discrete video card anyway and thus will probably go for a P55 chipset. And this is where the confusion sets in! I'll simply make a list here:
i5 661 idles lower than the 750:
(Intel P55, 6W DC difference): http://www.silentpcreview.com/article1013-page5.html
(both on Asus P55, 18W diff): http://www.techspot.com/review/233-inte ... age15.html
(Intel H55, 13W diff): http://www.hexus.net/content/item.php?item=21684&page=7
(though this pits i5-661+GMAHD against i5-750+GT220 so not really a fair comparison)
i5 661 idles EQUAL TO OR HIGHER THAN the 750:
(Gigabyte P55, equal): http://www.bit-tech.net/hardware/cpus/2 ... u-review/8
(Asus P55, 6W diff): http://www.techpowerup.com/reviews/Inte ... 61/12.html
(Asus H57, 9W diff): http://www.anandtech.com/show/2901/15
(though site acknowledges results could be faulty)
(Asus H57, 8W diff): http://www.tomshardware.com/reviews/int ... 14-15.html
There are probably more but I figured I wasn't going to find a holy grail of conclusion anytime soon! On one hand, I trust SPCR most and a dual core 32nm logically should idle less than a 45nm quad. On the other, they cost the same so I'd be losing two cores and paying for integrated graphics I wouldn't use (I do some heavy video editing sometimes so the quad would help!).
At the end of the day, I want to reduce my CPU power consumption (the 8800GT graphics is next on the chopping block!) but I would rather not lose too much of my current CPU horsepower. I don't care much for load power draw as the rig will be mostly idling. Is there something I'm missing in regards to the power draw between these two i5s?
Thanks in advance!
(EDIT: Improved readability)