No Surprises: Quad-Core Sandy Bridge Is Still Fast

We’ve already looked at the i7-2630QM when we reviewed the ASUS G73SW and previewed the MSI GT680R. The difference here is that we’re not looking at a 15.6” chassis that’s lighter and thinner than the GT680R, and we’re pairing the CPU with a GT 540M instead of a GTX 460M. For applications, the GPU generally won’t matter, but the presence of Optimus Technology will definitely help in several areas: better battery life, and access to Intel’s Quick Sync for video transcoding. We’ll do a quick check of performance with Quick Sync in a moment.

For the charts, we’re sticking mostly with mainstream laptops. We’ve had plenty systems come through our tests in the past year that meet that classification, and you can make your own comparisons using Mobile Bench. For our applications charts, we’ve got quite a few Arrandale systems and a couple Sandy Bright units, with a  smattering of GPUs ranging from IGP (HD 3000) up through GTX 460M. Given the pricing, the XPS 15 will mostly be playing in the $1000+ market, and our test system is very close to the price of laptops like the MSI GT680R and ASUS G73SW, so we’ll include the latter to show where the next performance tier lies. At the other end of the performance and pricing scale, we’re also including an AMD Brazos E-350 laptop, the HP dm1z. It’s not at all in competition with the other laptops—from either a price or performance standpoint—but it does offer plenty of battery life in an affordable package and we liked it enough to give it our Silver Editors’ Choice award.

The laptops we’ve chosen to highlight in this review are the Dell XPS L501x and L502x, in black and green, showing how the SNB update compares to the original. The ASUS G73SW is in red, showing where a faster GPU will get you, and the Sandy Bridge i7-2820QM with an SSD is in gold, providing the reverse picture: more CPU performance and a fast storage subsystem, but with a much slower IGP.

Futuremark PCMark Vantage

Futuremark PCMark05

3D Rendering - CINEBENCH R10

3D Rendering - CINEBENCH R10

Video Encoding - x264

Video Encoding - x264

PCMark always likes a fast storage subsystem, and it does give you some idea of how much more responsive a laptop can feel with a good SSD. The Sandy Bridge i7-2820QM ends up nearly twice as fast as the XPS 15 in PCMark Vantage, and 55% faster in the old PCMark05. PCMark also stresses the GPU a bit, which is why the ASUS G73SW ends up around 20% faster than the L502x. Overall, the i7-2820QM with SSD is 37% faster than the L502x and the ASUS G73SW is just 7% faster. The L502x ends up as the third fastest laptop in our application tests, and the only other laptop that manages to squeak by with a lead in the individual results is in the single-core Cinebench test, where the higher single-core Turbo of the K53E/i5-2520M wins out over core count.

Comparing to the original XPS 15 L501x is a bit easier, since all of the main components are at least somewhat faster on the L502x but still similar in specs. The result is performance that’s 20% to 100% faster than the L501x, with the 100% increases coming in the highly threaded Cinebench and Second Pass x264 encoding tests. On average, the L502x is 57% faster than the L501x, though for more mundane office/Internet workloads it’s probably more like 30% faster.

As noted above, we also did some tests of GPU accelerated video transcoding. We used CyberLink’s MediaEspresso and transcoded a 5323 frame 1080p24 video into 720p YouTube format using just the CPU, then with the GT 540M active, and finally using Quick Sync (i.e. HD 3000 active). With Quick Sync, MediaEspresso now has two encoding profiles available, fast and quality, so we tried both. In terms of performance, the CPU alone took 92 seconds, for a final speed of 58FPS. With the GT 540M, performance improved to 69 seconds/77FPS. Finally, Quick Sync with the “Quality” profile took 34 seconds (157FPS), while the “Fast” profile results in the quickest transcoding time, requiring just 25 seconds—or a very impressive speed of 213FPS.

As far as the transcoding quality, subjectively none of the encodes were all that great, showing a clear loss of fidelity from the original 1080p24 source—though that’s expected, considering the final file size was about 10% of the original. I also didn’t notice the issues we saw on CUDA encoding, but the home video I used may not be the best for picking out such details. (We noticed the problems originally on Arcsoft’s Total Media Converter, so it was likely just their implementation of CUDA transcoding rather than a general problem with CUDA, and the latest version might have fixed things.) A final interesting point to mention is that right now, NVIDIA’s Optimus Technology detects MediaEspresso and by default uses the discrete GPU, even though Intel’s Quick Sync is more than twice as fast. Thankfully that you can modify the profile to prefer Intel’s IGP—and on Arrandale’s IGP the dGPU would be preferable—but at present it doesn’t look like NVIDIA’s profiles are smart enough to detect your IGP and determine what path is optimal. That could be a problem down the road when Ivy Bridge and future IGPs continue to improve performance, but hopefully software updates will address the concern.

Okay, that’s enough talk about general application performance. Let’s see how the L502x fares in synthetic graphics performance before we get to the games.

Futuremark 3DMark 11

Futuremark 3DMark Vantage

Futuremark 3DMark Vantage

Futuremark 3DMark06

We’re updating our 3DMark charts to focus more on modern workloads, so we’ve added 3DMark 11’s Performance default to our benchmark list, and we’ve included results for 3DMark Vantage’s Performance setting as well—though we don’t have results for all of the other laptops on those charts. We’re also skipping the charts for 3DMark03/05, though you can still see the results in Bench.

Interesting to note is that the 3DMark 11 Performance test appears to be almost entirely GPU limited, as even with a P520 processor the HD 5650 comes out 12% ahead of the GT 425M (and the 540M in turn is 7% faster than the 5650). Depending on how well that comparison holds up, the GTX 460M looks to be around 80% faster than the GT 540M. On paper, the GTX 460M has 101% more computational power and 108% more bandwidth than the 540M, so realizing an 80% performance increase would be about right.

Elsewhere, what we see is a familiar pattern: all of the GT 400M/500M and HD 5650 parts cluster near each other, with the XPS L502x generally coming out on top. The problem is the huge gulf between the GT 540M and the GTX 460M we just mentioned, never mind the top performing mobile GPUs like the HD 6970M and GTX 485M. So once again, this is a decidedly midrange mobile GPU that will struggle with modern games at higher quality settings and higher resolutions—which is what we’ll see next. As far as upgrades from the Arrandale platform, thanks to the increased GPU bandwidth and faster core clocks, plus the quad-core SNB CPU, the new L502x is around 25-35% faster than the old L501x in the 3DMark results. Now let’s find out if that same margin of victory holds in actual games.

Design and Other Considerations Better Midrange Graphics, But Still Midrange


View All Comments

  • JarredWalton - Wednesday, April 20, 2011 - link

    Nope; no one has put USB3 into the chipset yet. AMD probably will with their next update I'm guessing, but Intel will likely be pushing Thunderbolt instead. Reply
  • jcannon1018 - Wednesday, April 20, 2011 - link

    Even ivy bridge? Reply
  • BioTurboNick - Wednesday, April 20, 2011 - link

    Ivy Bridge isn't out yet, so it doesn't count. But it will be getting USB3 Reply
  • Neoarun - Wednesday, April 27, 2011 - link

    Well i have got this laptop and i can see that it indeed has a USB 3.0 .... Reply
  • aneuwahl - Sunday, April 24, 2011 - link

    This was proven to have no effect at all on the issue we are talking about. In the forum I linked this was widely tested... Reply
  • aneuwahl - Thursday, April 21, 2011 - link

    It is not necessary to have a USB3 device attached to the ports for the problem to come out. It occours to me with a wireless mouse receiver, or a USB keyboard... Reply
  • FlyBri - Wednesday, April 20, 2011 - link

    ...because Dell just sucks as a company. I really don't care how good their computers are, because if you have a problem with something from them, don't be surprised if they don't really care at all about you. I've never seen so many comments that say "Dell doesn't care", and that even customer support has said that directly to customers as well.

    Dell doesn't care about doing right by its customers, they don't care about BBB complaints, they commit certain acts of fraud, and they don't care to follow consumer protection laws (this is from my own personal experience). In addition, I just heard from a person who worked at Dell for 11 years and said even for him as an employee it went from a great place to work to being unbearable.

    So just a warning to people out there -- some of their products may be decent and come at a good price, but if you EVER have any issues, watch out, because you could be in for a heap of trouble.
  • jabber - Wednesday, April 20, 2011 - link

    Service I've had from Dell has been superb over the past 18 months.

    Had a power issue with my laptop (turns out the laptop/battery just got 'confused' somehow and a boot without the battery fixed it) called it into Dell and two days later TWO new laptop power supplies turn up. Not needed in the end but really handy. So no complaints there.

    A month before the warranty ran out on my laptop I noticed a small piece of one of the key legends had worn off. I took a gamble and called it in at 1pm, no trouble I was told. 11am the next morning a nice chap turned up at my home and swapped out my keyboard. 10 minutes and he was gone. Perfect.

    That was just the standard thrown in cover too. Couldnt be happier.
  • TypeS - Wednesday, April 20, 2011 - link

    Ah rabid posters... you need relax a little bit there buddie. Dell cares about it's customers as much as any of the other top electronic manufacturers do; that you buy their stuff and continue to do so.

    Having worked at a computer store for the last 2 years, I've dealt with Dell, IBM/Lenovo, HP and ASUS, and they all provided acceptable service for in warranty products.

    Has Dell been dishonest about it's business practices? Well who hasn't? Intel recently settled with AMD and NVIDIA for it's strong arm tactics and memory and lcd manufacturers have been caught on in price fixing schemes.

    I can tell by your post that you probably had a horrible experience with Dell and I won't challenge you on it but one experience out of millions doesn't carry much merit.
  • SeanPT - Wednesday, April 20, 2011 - link

    Protip: Buy from Dell Business instead of home. I've been working exclusively with Dells since 2002 for all of my clients that have basic office needs. I've sold thousands of Dell laptops and PCs and I rarely have a problem. When I do I can do a quick chat and have someone out the next day. Reply

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