NVIDIA's GeForce GTX 680M in SLI

Introducing the Alienware M18x R2

Around the launch of the Alienware M17x R3, Alienware essentially bifurcated its high end notebook offerings into single-GPU (the M17x R3) and dual-GPU (the M18x). The M17x R3 was slimmed down from its beefy predecessor and the M17x actually remains one of the sleeker desktop replacement notebooks available. The M18x had to take its place at the top of Alienware's stack, then, as their contender for the most powerful gaming notebook on the market.

That contention continues with the M18x R2, which like the M17x R4 we recently reviewed is more of an incremental update than a fully-fledged new design. The R2, like the R4, brings with it an Ivy Bridge CPU and a pair of Kepler-based NVIDIA GeForce GTX 680M GPUs in SLI. As we saw, NVIDIA made fantastic gains with the 680M over the 580M; if that didn't impress you enough, you may want to hold on to your hat because two 680Ms in SLI are liable to blow your mind.

If you're having trouble getting psyched about this monster, I don't really blame you. We reviewed a pair of Alienware M18x's last year and came away with mixed feelings. Performance was as fast as you could ask for, bar none, but the M18x really pushes the limits of just how big a gaming notebook can get. It's heavy enough that it can be uncomfortable on your lap or even to cart around from place to place, and I've even personally recommended to people shopping for gaming notebooks to go with the smaller M17x. The M17x is easier to move around, can benefit from Optimus instead of having to stick to switchable graphics (that demand rebooting), and I actually prefer not having the gaming macro keys.

Of course, those macro keys and the potential for SLI may swing some users. If you're one of those users, the M18x R2 may be for you, so let's dig in.

One thing's for certain, the Alienware M18x R2 as we have it in for review does not come cheap. Its starting price of $1,999 for just an i7-3610QM and a single GTX 660M is pretty high to begin with, and the upgrades are all pricy. This is another one of the reasons why I tend to recommend the M17x over its bigger brother, but if you absolutely must have the most performance you can cram in a notebook, pricetag be damned, obviously this is the way to go.

It's rare to see an Ivy Bridge CPU like the Intel Core i7-3820QM floating around in the wild. While top-end CPUs like the i7-3770K easily find their way into desktops, most notebook vendors are content with entry level chips like the perfectly adequate i7-3610QM. The i7-3820QM is a respectable piece of kit, though, boasting a nominal 2.7GHz core clock and able to turbo up to 3.5GHz on all four cores or even an impressive 3.7GHz on a single core. That means that despite the low 45W TDP, the i7-3820QM is actually able to ramp up clocks to the point where it's competitive with last generation's desktop quad cores and nip at the heels of chips like the i7-3770 non-K.

What we're really here for are the pair of NVIDIA GeForce GTX 680M GPUs in SLI. As I mentioned in the M17x R4 review, the silicon is basically a die-harvested GK104 identical to a desktop GeForce GTX 670 but with reduced clocks. Interestingly, it seems Alienware is getting different 680Ms than boutiques, as the pair of 680Ms in the M18x R2, like the M17x R4, only have 2GB of GDDR5 instead of 4GB. I don't consider this a drawback at all; even the desktop GTX 680 has a very difficult time utilizing more than 2GB of GDDR5, so the extra 2GB just winds up being mostly a waste. I'd rather have just the 2GB of GDDR5 than gain maybe a frame or two at the cost of additional power and heat.

The pair of 256GB Samsung PM830 SSDs in RAID 0 is impressive and mightily fast, though I continue to be skeptical about the value of putting SSDs in a striped RAID. Alienware leaves the M18x expandable, though; there's an mSATA slot and a third drive bay if you need it.

Ultimately though, the M18x R2 is as much an incremental update over its predecessor as the M17x R4 was, so the pro's and con's from that shell still essentially carry over here. The addition of mSATA is appreciated, as is the Killer Networks wireless-n, but the Creative sound chip is more of a "well, that's nice" inclusion, and nothing about the shell itself has really changed. Even the display panel is the same. If you own a first-generation M18x, you may not be missing that much here.

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