Why Sandy Bridge Matters for Notebooks

To say that we were caught off guard by Intel’s announcement last Monday of a flaw in their 6-series chipsets would be an understatement. Bad as that was, it’s the OEMs and system builders that are really feeling the pain—not to mention all the money Intel is losing on this “not a recall”. We’ve seen plenty of manufacturer statements about what they’re doing to address the problem, and we’ve also been talking with our notebook contacts trying to find out how the problem will impact availability.

We’ve also had more than a few delayed/canceled reviews while we wait for a fix. While we’ve looked at a generic Sandy Bridge notebook and a few motherboards, there was still plenty more we wanted to discuss. One such notebook came with a “low-end” i7-2630QM processor and a GTX 460M GPU, packed into a 15.6” chassis and sporting a 1080p LCD and RAID 0 hard drives. The manufacturer asked us to hold off on the full review, and we’ve returned the notebook, but not before we ran it through our suite of mobile benchmarks. Rather than complete a full review of a notebook that may or may not be available, we thought it would be interesting to look at what another SNB notebook would do in comparison to the previous generation parts.

Update: We just got word back, and MSI has given the okay to reveal that the notebook in question is the MSI GT680R; we should hopefully see it return to market in a couple months.

In terms of specs, the notebook in question was very similar to the ASUS G73Jw we reviewed last year. Change the CPU to an i7-2630QM in place of the old i7-740QM, use a different battery and chassis, and you’re set. So exactly what can the 2630QM do relative to the 740QM? We’ve added the complete benchmark results to our Mobile Bench area, so you can quickly see how the two stack up.

If you’re only interested in gaming performance, it’s no surprise that we’re mostly GPU limited with the GTX 460M. The majority of titles are 2-8% faster with the Sandy Bridge setup, but we’re also dealing with updated drivers so the performance increase may come at least in part from NVIDIA. That said, there are a couple of outliers: 900p STALKER: Call of Pripyat shows a massive performance increase, as does 900p StarCraft II. How much of that comes from drivers and how much from the CPU? Since we don’t have the G73Jw around to retest, it’s impossible to say for certain, but we can look at the CPU tests to see how much faster Sandy Bridge can be compared to Clarksfield.

PCMark as usual is heavily influenced by the storage subsystem, so RAID 0 versus a single HDD gives the unnamed system an inherent advantage. The use of Western Digital’s Scorpio Black drives versus a Seagate Momentus 7200.4 is another benefit in the storage area—WD has generally come out on the top of the HDD heap with their Black series (though SSD’s are still much faster). Ignoring PCMark, though, we still see a large advantage for the 2630QM. Single-threaded performance is 21% faster in Cinebench 10/11.5, which in our experience correlates well with general Windows use. In the heavily multithreaded tests, the gap increases to 47-58% in Cinebench and x264 encoding.

It’s not just about performance either. While the 2630QM notebook has a larger 87Wh battery, factoring that into the equation we still see relative battery life improved over the G73Jw by 17% at idle, 40% in H.264 playback, and 42% in Internet surfing. Looking at the comparison with 2820QM with HD Graphics 3000, the GTX 460M still clearly takes a toll on battery life (less than half the relative battery life), but it’s good to see more than three hours of mobility from a gaming laptop.

We’re curious to see if anyone is willing to do Optimus with a 460M (or higher) GPU and a quad-core SNB processor, as that will only serve to further increase battery life. Of course, we still see occasional glitches with Optimus that might make OEMs slow to use it on high-end gaming systems. For instance, Empire: Total War won’t let you select higher than “Medium” detail defaults (because it queries the IGP capabilities rather than the dGPU). Left 4 Dead 2 also had some oddities with the latest driver update—you can’t max out the graphics settings and have it run properly with a GT 420M Optimus in our experience; you have to drop the “Paged Pool Memory Available” setting to Low instead of High/Medium or it will exit to the desktop. The result is lower performance/compatibility relative to discrete GPUs, but I’d be willing to deal with the occasional bug for dramatically improved battery life.

So far the Sandy Bridge discussion has been quad-core SNB vs. quad-core Clarksfield, and that’s the other looming question: just how good will the dual-core SNB chips be? We expect better than Arrandale performance and better than Arrandale and Core 2 Duo battery life, but we haven’t been able to test any dual-core SNB systems yet. Unfortunately, the chipset bug/recall/whatever-you-want-to-call-it means we won’t be able to categorize dual-core SNB performance for at least another month, probably two. It appears the revised chipset allocation is going to go first towards big OEMs (i.e. Dell, HP, etc.), and it would seem Intel is focusing first on getting the mobile chipset fixed over the desktop chipset. Several manufacturers have indicated they expect laptops with the revised chipset to hit the market in the late-March to early-April time frame.

A Farewell to the Dell XPS 14
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  • andy o - Monday, February 07, 2011 - link

    Thanks for the updates, first of all.

    Black level, instead of brightness, is more indicative of contrast ratio in real world uses. Because to achieve the max, you have to bring brightness to the max, and on an LCD it can be blinding. I have a pro NEC monitor for photos, and it reaches like 390:1 at 110 cd/m2, which is about what a calibrated monitor should be. It can go up to about 800 at max brightness, but it's useless at that setting.

    That said, black level quality also varies with different types of LCD. IPS-based usually gets higher black level, but dark color tracking is much better. PVA screens suck when you look at them straight on. See <a href="http://forums.dpreview.com/forums/read.asp?forum=1... to see what I mean. Most laptops' have cheap TN panels though. I think these qualities should be considered in monitor reviews as well, just a thought.
    Reply
  • andy o - Monday, February 07, 2011 - link

    So no html...

    Anyway, my point was that the Asus laptop, will likely reach a higher contrast ratio at regular, usable brightnesses. If the Envy's panel is IPS though, I'd choose much lower contrast ratios in order to have better dark colors and consistent colors.
    Reply
  • JarredWalton - Monday, February 07, 2011 - link

    Most of the laptops and displays I've tested have been generally consistent in contrast ratio, so if you get 1000:1 at maximum brightness, dropping to 100 nits will still give close to 1000:1 -- it might be 900:1 or it might even increase to 1100:1, but that's not enough to really make a difference. I usually feel like you need at least a 25% change in contrast before you really notice it with the naked eye.

    As far as IPS panels and laptops are concerned, the only IPS option I'm aware of right now is the upgraded HP EliteBook 8740w LCD, which costs I think $550 or so. Ouch!
    Reply
  • softdrinkviking - Tuesday, February 08, 2011 - link

    the 15" HP Elitebook also lets you choose a dreamcolor HD display as well (which I think is what indicates IPS) $425 upgrade. still high, but where else can you get a good, non-apple laptop display? Reply
  • Luke2.0 - Monday, February 07, 2011 - link

    1. Nice opening image of broken chip...

    2. I was looking forward to a review of Asus N53SV (or SN). Is it among those delayed / canceled ones?

    3. (personal rant) I might start tinkering on Ivy Bridge now...
    Reply
  • JarredWalton - Monday, February 07, 2011 - link

    Everything with Sandy Bridge is at least delayed right now, including the N53, G53, and G73 updates. I hadn't received any of the ASUS models yet, but I was expecting them to arrive last week. Then Intel drops that bomb and everything SNB related disappears. :-( Reply
  • MrSpadge - Tuesday, February 08, 2011 - link

    For regular notebooks they should just use the 2 SATA3 ports and be done with it.

    MrS
    Reply
  • DanNeely - Tuesday, February 08, 2011 - link

    Many laptops have eSATA ports so they need fixed. Beyond that, even if the boards aren't using the faulty ports you can be certain that some bottom feeding class action lawyer would end up suing over every dead port if they use the faulty chipset. Reply
  • vikingrinn - Monday, February 07, 2011 - link

    @Jarred Walton or Vivek Gowri

    Since you compared it with the G73Jw, did the "One such notebook came with a “low-end” i7-2630QM processor and a GTX 460M GPU, packed into a 15.6” chassis" just so happen to have a 17.3" display with backlit keyboard? ;)
    Reply
  • BWMerlin - Monday, February 07, 2011 - link

    @vikingrinn How can it have a 17.3" display when the chassis is only 15.6"?

    My bet is either the ASUS G53 or the MSI equivalent.
    Reply

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