CPU/General Performance Discussion

With that out of the way, let’s focus on the remaining two areas, starting with CPU performance. I’ve grabbed several generations of desktop CPUs from both AMD (K10.5, Llano, Trinity, Bulldozer, and Piledriver – we don’t currently have Richland results, but they’re generally 5-10% higher than Trinity) and Intel (Sandy Bridge, Sandy Bride-E, Ivy Bridge, Ivy Bridge-E, and Haswell) and combined those results with the latest mobile CPUs (Haswell quad-core, Haswell ULT, and Richland). We’ve got two benchmarks that are common to our CPU and laptop we’re going to look at: Cinebench 11.5 (single- and multi-threaded) and x264 HD 5.x video encoding (first and second pass).

Unfortunately, we don’t have results for all of the desktop CPUs in x264 HD 5.x, though you can get an idea of where they should fall by looking at the x264 HD 3.x results. We’ve gone ahead and used the x264 3.x scaling for desktop CPUs where we don’t have 5.x results, and marked those results with an asterisk (*) in the following graphs. The first pass tends to be about 2x as fast with x264 HD 3.x, unless you have four cores with Hyper-Threading in which case scaling is closer to 1.5x (and 6-cores results in scaling of around 1.08x). The scaling in the second pass is much more uniform, with 3.x being around 2.75x as fast as 5.x. Since we’re already comparing apples and oranges in a sense (desktop and laptops, with different motherboard, RAM, etc.) we’re really just interested in an estimate of performance. Do not take the following charts as 100% definitive, but rather as a baseline comparison.

Cinebench R11.5 - Single-Threaded Benchmark

Cinebench R11.5 - Multi-Threaded Benchmark

x264 HD 5.x

x264 HD 5.x

It used to be that if you wanted top CPU performance, a desktop system was absolutely required. These days, for lightly-threaded workloads the gap has narrowed substantially: a moderate i7-4700MQ Intel Haswell processor will get you around 85% of the performance of the desktop i7-4770K, and the i7-4930MX will get you 98% of the single-threaded performance. Even the i7-4500U Ultrabook is able to deliver 75% of the 4770K performance. Move to heavily threaded workloads and the gap grows (particularly if we included the hex-core processors), but the 4700MQ and 4930MX are still 81-87%/91-98% of the 4770K performance – it’s the dual-core mobile CPUs that really take a hit, with the i7-4500U delivering roughly one third (37-41%) the performance of the 4770K. Of course, if you’re not doing CPU intensive tasks like video encoding, the single-threaded performance will be the more pertinent result.

The AMD side of the equation isn’t nearly so rosy, at least if you want performance anywhere near that of a top-end desktop. Llano, Trinity, and Richland have been far more focused on reducing power use and increasing integrated graphics performance than on boosting CPU performance. The result is that in single-threaded performance, the fastest mobile Richland APU is less than half the performance of the 4770K, and in the multi-threaded tests it’s 26-31% of the 4770K performance. Comparing mobile Richland to desktop AMD parts doesn’t really help much either: in the single-threaded Cinebench result, it basically matches the Llano A6-3650 and is 12% slower than the A8-3850, while it trails most of the other AMD CPUs/APUs by nearly 30%. Move to multi-threaded workloads and it’s only able to deliver 30-60% of the more powerful AMD desktop APUs (and 60-80% of the desktop Llano APUs). Richland is still “fast enough”, but it’s definitely a value proposition as opposed to a performance option – the iGPU of Richland may be faster than HD 4000/4400/4600, but dGPUs like the GT 730M are still roughly twice as fast and available for not much more money. But we’re skipping ahead….

Summarizing the general performance of our mobile platforms, we’re able to come pretty close to the performance of desktop systems, and while there’s still a price premium in effect it’s definitely getting smaller than in the past. The least expensive laptop/notebook I can find right now with a quad-core Haswell CPU is the HP Envy 15t-j000, which you can currently get for $700 after the $100 instant discount. That will get you 8GB RAM, 1TB HDD, and Windows 8, but not too much else. Adding a 1080p LCD ($50), GT 740M ($70), and a backlit keyboard ($30) brings the total to $850. That’s roughly the same performance as a Sandy Bridge i7-2600K, and slightly faster than the Haswell i5-4670K. You can get a pre-built desktop from Newegg for $700 (which adds in an HD 7750 GPU), while a DIY system with similar specs to the laptop (e.g. no dGPU) will set you back $672 (see table below) – not including a mouse, keyboard, display, or speakers.

Mainstream Desktop PC
Component Description Price
CPU Intel Core i5-4670 (Quad-core, 3.4-3.8GHz, 6MB L3, 22nm, 84W) $200
Motherboard ASRock Z87 Pro3 LGA-1150 $115
Memory 2x4GB DDR3-1600 CL9 1.5V RAM $65
Storage Seagate 1TB 7200RPM HDD $70
Optical Drive SATA DVDRW (Lite-On) $18
Case Antec Three Hundred $60
Power Supply Seasonic 350W 80 Plus Bronze $44
Operating System Windows 8 64-bit (OEM) $100
Total $672

In other words, if all you want is a computer for moderate needs, it’s not hard to see why laptops are displacing desktops for many people. In this case we’re able to get the same level of performance for potentially less money (depending on whether or not you need to buy an LCD, keyboard, and mouse). Desktops are still going to be far more upgradeable, and you can take a “basic use” desktop like the one above and upgrade it with a high-end graphics card for $300 to get a potent gaming PC. Adding more memory, more storage, upgrading the motherboard and CPU, etc. are all things that you can do with a desktop, whereas with laptops typically only the RAM and storage can be upgraded/replaced and if anything else breaks you’ll have to send it in for repairs (or buy a new laptop).p

We can go down to lower price points of course – there are desktop PCs with moderate hardware starting at just over $300, and they’re still more upgradable than laptops, but similar performance laptops can be had for about the same price, especially if you look at some of the previous generation hardware. It’s mostly a question of how much performance you want/need, and whether you’re interested in the potential to upgrade components down the road. If you don’t have any plans of adding more RAM, storage, or a GPU the case for laptops is stronger now than ever. And let’s not forget that most laptops have an idle power draw south of 20W, compared to 40-60W for a typical desktop (and that’s not including the display or speakers on the desktop), so the energy factor also favors laptops.

Introduction: Analyzing the Price of Mobility GPU/Graphics Performance Discussion
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  • WiSH2oo0 - Wednesday, September 11, 2013 - link

    Cheers Garrettino and have a good day! Reply
  • carage - Saturday, September 7, 2013 - link

    If the laptop has an ExpressCard slot (hint: business laptops or mobile workstations) or Thunderbolt port you could settle for a high CPU model regardless of whatever GPU comes with the laptop and go the external route. There are some additional costs to this expansion, like you would likely need connectors and/or enclosures that run from $100 ~ $900 (Thunderbolt Enclosure), and the cost of whatever desktop card you want (nVidia recommended due to Optimus Compression technology). Even then there will still be performance penalties, because the external port bandwidth is nowhere near PCI-E 16X. But after these upgrades, a $1500 laptop with a GTX 670/680 can still take on a $3000+ monster gaming laptop. Reply
  • nerd1 - Saturday, September 7, 2013 - link

    Sony vaio Z already tried the thunderbolt external GPU idea and it sucked.

    1. bandwidth is so limited so it's total waste of GPU power.
    2. Thunderbolt enclosures are terribly expensive, and it make more sense to just build another desktop than use them, unless you are forced to (like new mac pro)
    Reply
  • mapurisa - Saturday, September 7, 2013 - link

    The Vaio Z used a midrange mobile GPU instead of a high performance desktop GPU which completely defeated the purpose.

    The technology isn't perfect by any stretch but for a significant portion of the market this would be a good solution but there's no incentives for the AMD/Nvidia to make it happen. Intel being the only non-GPU (in the traditional sense) manufacturer is happy with the current state of affairs ; it can play the same overcharging game for its Iris Pro chips without losing any marketshare or profits.
    Meanwhile Thunderbolt withers on the vine and consumers get the shaft.
    Reply
  • nerd1 - Saturday, September 7, 2013 - link

    Yes it used midrange mobile GPU, and the performance drop was already like 50%.
    With higher performance GPU the performance drop due to bottleneck will get even higher.
    Reply
  • digitalgalt - Saturday, September 7, 2013 - link

    I use a ViDock loaded with an EVGA 760 Ti tied to my Lenovo T520 (with only Intel HD3000 integrated graphics) and it basically demolishes all games at 1920x1200.
    I don't even want to try Crysis 3 on it, that is well past the Express Port choke point. But for a hard metric, I can run Fable 3 and the Witcher 2 at 1920x1200 with all settings to ultra, around 30-35 frames per second.
    Reply
  • nerd1 - Saturday, September 7, 2013 - link

    If you can be satisfied at 765M performance (which can run most titles at 1080p with medium settings) actually laptops are cost effective. Also laptops are pretty much a must nowadays especially for university students, so it still is cheaper to have $1800 laptop than $800 ultrabook and $1200 desktop. Reply
  • Impulses - Sunday, September 8, 2013 - link

    Not much cheaper tho, and the desktop is easier to upgrade... I think you can easily make an argument for going either way, it ultimately comes down to personal preference and other intangibles... i.e. Are you gonna game while on the go or would you rather have a lighter laptop? Do you even have space for a desktop or would you actually benefit from having two discrete systems? Etc etc. Reply
  • purerice - Sunday, September 8, 2013 - link

    Agreed with impulses on it not being cheaper. That desktop is more like $1100, but if I had that, why would I need an ultrabook? I completed post-grad with a $1000 desktop and $400 laptop. An ultrabook would have been a tacky fashion statement.

    Getting a new CPU/GPU for Anand's reference PC would be $450. To get that same new CPU/GPU in that laptop, you'd need to spend $1800 again.
    Reply
  • brucek2 - Saturday, September 7, 2013 - link

    I think this is my first time seeing the AMD Center branding on an article (I'm guessing because it has an AMD tag?) I've got no objections to the concept, but boy is that red text and red button background unattractive. On my monitor I'm not sure it even matches Radeon red branding (could be by monitor's lack of calibration of course)?

    Maybe there's a way AMD could could get some custom vertical elements or something while the site sticks with the standard colors for the main article text and controls?
    Reply

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