Item	Toshiba M840	Toshiba P840
Processor	Core i7-3612QM	Core i5-3317U
Processor generation	Ivy Bridge	Ivy Bridge
Processor type	Mobile	ULV
Nominal clock	2.1 GHz	1.7 GHz
Maximum clock	3.1 GHz	2.6 GHz
Cores	4	2
Threads	8	4
Max system power draw	90W	65W
Memory amount	8 GB	8 GB
Memory type	DDR3	DDR3
Memory clock	1600 MHz	1600 MHz
Graphics (integrated)	Intel HD Graphics 4000	Intel HD Graphics 4000
Graphics (dedicated)	AMD Radeon HD 7670M	NVIDIA GeForce 630M
Graphics memory	2 GB	2 GB
Display options	VGA, HDMI	VGA, HDMI
Disk storage	750 GB	750 GB
Disk RPM	5400 RPM	5400 RPM
Hybrid?	No	No
Optical drive	DVD Super Multi	DVD Super Multi
Optical drive size	Normal	Slim
Chassis	Plastic	Aluminium
Keyboard	Compact	Compact
Keyboard illumination	No	Yes
Fingerprint reader	No	Yes
Tracking device	Trackpad	Clickpad
Multi-touch?	Yes	Yes
Screen resolution	1366x768	1366x768
Screen type	TN LCD	TN LCD
Screen size	14.0"	14.0"
3D support?	No	Yes
Webcam	720p (~1.2MP)	1080p (2MP)
USB ports	2x 3.0, 1x 2.0	3x 3.0
USB port power	2x high, 1x standard	2x high, 1x standard
Speakers	SRS	Harman Kardon + SRS 3D
Dimensions	340 x 232 x 30.05 mm	349 x 234 x 29.00 mm
Weight	1.99 kg+	1.96 kg+
Operating system	Windows 7 Home Premium	Windows 7 Home Premium

Assuming that they have negligible price difference, which would you want me to pick?

Seems like everyone for the most part agrees, but for the battery drain, pretty sure most computers these days can underclock and/or turn off cores whenever necessary, so it's probably more in the sense of complete system efficiency. The power brick, on the other hand...

I wonder whether I'll regret not getting a clickpad after spending almost half a year with one, though.

EDIT/UPDATE: The 7670M seems underpowered by a long shot compared to the 640M, even with the i7 backing it up. Judging from benchmarks, I guess since I'm supposed to make use of my gaming library, and there's a bit of a warranty issue with the M840, looks like P840 is my only real choice.

Hey, at least I'll enjoy the premium extras, huh?

EDIT/UPDATE 2: Mistakes abound! The P840 should have a 630M instead, which makes its performance about level than the 7670M, depending on whether the game is D3D or OpenGL (former favours NVIDIA, latter favours AMD)...

I'm a-swinging.