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E6440 is the superior machine, particularly the newest revisions that use an eDP FHD LCD. You are correct with regards to the quad-core option factory option being removed. You can get around that by doing your own user upgrade to a quad core.

E6440 benefits over E6430:

* mSATA slot

* Series-8 chipset with DEVSLP support

* 4th gen i-core CPU allowing undervolting with XTU/Throttlestop

* FHD eDP LCD panel option in newest revision

* significantly better looking machine

- no longer had default expresscard slot, need to option it up

If looking to do a quad-core upgrade then suggest grabbing the HD8690M dGPU version. It has a better cooling system to dissipate the higher heat levels more effectively.

Then again, your quad-core E6430 is a high performance unit. It might be worthwhile waiting and skipping the E6440 and grab the Broadwell refresh instead? It will bringing a reduced 22nm->14nm manufacturing process. Expect more performance/lower temps. The 32->22nm change (SB to IVB) allows quad core CPUs to increase from about a x27 multiplier to x35 @45W TDP. That's +800Mhz more across 4 cores. We may see similar improvements with Haswell -> Broadwell.

REF: http://forum.techinferno.com/throttlestop-realtemp-discussion/6958-haswell-step-backwards-ivy-bridge-i-have-some-shocking-tdp-results.html

Hey, cheers for your reply.

Looking at it, I think you're right. Until the Broadwell comes out, I can upgrade the e6430 to be, as far as I can see, in terms of some hardware at least, superior or equivalent to the e6440 (without replacing the e6440's processor).

Hello guys,

I am considering buying an E6440 to replace my E6430. However, I have some concerns, and a question. In every respect, except the possible 512gb ssd, the e6440 seems to be worse than the e6430.

The best processor for the e6440 is only dual core and is clocked at just over half of what the best processor for the e6430 gives (5000 vs 9000), which I have. I have read that it is more power efficient to have more cores run at a lower level than fewer at a higher level, and reviews confirm that the e6430 is quite power hungry. The graphics card, despite being 2gb in the e6440, is, noticeably worse than the 1gb graphics card in the e6430 according to passmark (451 vs 630).

Finally, it doesn't look like the newer latitude has a LED screen, like the retina display on the macbook. Reviews i've read say that the display is actually quite poor on the e6440, but my e6430 display is quite good. My concern again here is power consumption. A OLED screen could be set to all black with white text for certain applications, or get a black background. Lowering the brightness would reduce the power consumption (and if I recall correctly, this is not entirely the case with LED backlit screens, because the backlight never goes off.).

Therefore, if any of you already had the e6430, would you consider buying the e6440? Assuming I didn't want to void the warranty by tinkering with the insides.

Thanks, and apologies if I've asked any questions that've already been answered.