Really?Somehow I couldnt run Ultra..It feels like capped FPS to me.

It's either PS Vita or a new smart phone which will be either Galaxy Nexus or Galaxy Note.If I'm buying PS Vita,then it's gonna be a cheaper smart phone  I heard somebody is working with the crack for Vita
Hmm...I dont feel smooth when playing GTA IV on high setting.Perhaps the game booster helps a lot?
Finished Assassins Creed Revelations but mine is Jack Sparrow's version with patch 1.01.Now playing Batman Arkham City

That's awesome!    The most i've got from a single one was 7.8 on an Intel SSD.

lol, sorry bro, having class for the whole day@@ didn't notice ur post. Well now i'm quite busy coz i need to present case for my doctor. So for now i cannot make a guide with pictures.

But i can roughly guide u here thru words. Ok, first thing first, u turn to the bottom of the laptop. Unscrew every screw u see, take out ur harddisc(the whole thing with the metal thing), unplug ur ram also. Coz there is a hidden screw under the ram, this screw secured ur touchpad one. The wifi card u might wan to plug off the black and white wires. Then remember there are 3 more screw under the battery(if u are plugging battery now). Then u can take a flat screw driver to pry ur dvd-rom out which will make ur disassemble much easier(just one screw securing the dvd-room at the back).

after u unscrew everything single screw ady, flip it back and open up ur lid. Now u will take out the speaker grill first. U might need something sharp coz the grill fit nicely. U need to pry off from both left and right top corner. U might need to use a bit of force coz there are hinge under it. after the speaker grill come off, there are a few more screw securing the keyboard and the speaker. As usual, unscrew all of them.(make sure u put ur screw accordingly so u know how to put it back later). After the keyboard come off, u will see a ribbon attached to ur keyboard and touchpad. Unplug them both also. Then there are a few screws securing the metal with the motherboard. Unscrew them also. Ok, now u need something sharp also, u need to start prying the edge of the whole front plate(the place it hold keyboard, the touchpad and all). There are hinge all around it so u might need to go slow and take ur time.

After u take out the whole thing, ur motherboard is pretty much exposed. But the usb port vga port are still attached to the left side of ur laptop. So u might wan to push it a bit from the outside then ur motherboard goes free xD.

Now the only wires that attached to the motherboard should be the screen only. For my case coz it seems too fragile so i didn't unplug it. I just let the screen attached to my motherboard. Now the heatsink for gpu and cpu are beneath the motherboard. Turn it over, then u should see them.

WARNING(!!!!!) this is very important, u should see a yellow sticker for warranty one stick somewhere around here(mine one was sticked on one of the cpu screw). I took it out slowly and stick it somewhere else. Don break this sticker, its warranty sticker.

WARNING(!!!!!)before u unscrew and take out ur heatsink, becareful, next to ur cpu there is a thing black in colour that has a shape for a flat screwdriver one. That thing basically locks ur CPU in place. So basically u need to use a flat screw driver to turn it to the other side to unlock ur cpu. If u try to take the cpu out with this thing locked u might breaks ur cpu.

So u are pretty much there xD. Just take out the heatsink, clean it properly, make sure u wipe the remaining thermal paste clean. Then apply ur new artic cooling mx-4 xD. Don apply too much, if too much it might cause negative effect. Then after that slowly assemble back ur laptop xD.

i always get random freeze & sound distortion when playing games. I can't open up task manager or even force shut the program, only by pulling the plug or the on button for few seconds. Hmmm is this hardware or software based problem? So far no crashes when running stress programs like furmark n intel burn test.

The cards performance itself should be close,
The N55SF should run games better and cooler, since it has lower resolution as well, assuming the M15x you refer has Full HD.
But, the M15x have more potential in upgrading, you can upgrade to nVidia GTX580M/AMD HD6970M..

that one quite high performance
anyway i try to compare which may run games faster and ok
gtx260m or gt555m?
coz im so confused between m15x with gtx260m or n55sf with gt555m
gtx260m come with 1gb grafik memorie, but this asus come with gt555m 2gb
wich is better?