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
POST A COMMENT

110 Comments

View All Comments

  • JarredWalton - Monday, September 9, 2013 - link

    There's also the screen size issue. For handheld tablet use, a 7" screen is fine. Sitting on a desk with a keyboard, however, 7" can be painfully small for anyone over 30 or with moderate vision to read. Even 10" tablets may not work for everyone, but at least I can make a good go at it. Reply
  • rburnham - Monday, September 9, 2013 - link

    It really does come down to lifestyle. A buddy of mine is on the go a lot, so he invested in a good Alienware gaming laptop. It's big, it's fast and it can double as a nice workstation too.

    On the flip side, I currently do not travel at all, so I have a desktop workstation and desktop gaming PC. However, I plan to move to a new area in the near future, where I will be traveling on the weekends. I will keep the gaming desktop, but the workstation will be replaced with a mid-range gaming laptop, which will double as a 1080p workstation while at home.

    I just love that we have these options. It's a great time to be a computer user.
    Reply
  • Sadrak85 - Monday, September 9, 2013 - link

    The facts here actually support a slightly different conclusion, although noted to be out of the scope of the article; for "basic" computing needs such as web-browsing, you don't need massive performance, and even those laptops are more than required. Mobile is the answer. Mobile can handle email, web, basic text-editing, some photo, and presentations. Thus, the ideal setup is your own preferred mobile device and a desktop for 1)ergonomics, 2)value, 3)speed, 4)reliability. Forget the laptop entirely! It's the "Utility Van" of the modern era. Niche cases, like hardcore gamers on the go, or someone who needs just enough power on the move to whine about a tablet, but not enough to remote-desktop to a more powerful machine. The only reason there is still a laptop in my home is because it's a relic of my wife's college days, and it's nice to play Minecraft in the same room as her (she gets the 3240x1920 display when we play together because I'm a gentleman). Reply
  • JarredWalton - Monday, September 9, 2013 - link

    I mentioned tablets in the introduction, and for most people that need to type anything I still feel laptops are far superior to tablets. Others will disagree with that, and that's fine, but I have typed a fair amount on my two 10" tablets over the past two years, and I don't like it at all. Adding a keyboard could fix some of the issues, but then I have something larger to carry around and a 13.3" laptop (or 14" laptop) is still going to provide a much better keyboard experience for anyone that doesn't have petite hands. Reply
  • Sadrak85 - Tuesday, September 10, 2013 - link

    Yeah, but an ergonomic desktop keyboard is better still; tech journalists who travel need decent laptops because they're writing in hotel rooms, etc., and maybe paperback novelists need the inspiration of writing in a cabin in the woods, but when I update my website, I do it in front of my desktop, in my home office, where a laptop would cramp my style. Reply
  • max1001 - Monday, September 9, 2013 - link

    Gamers are what keep the desktop market alive. You can keep playing games on release date at max setting as long you keep upgrading your GPU now and then. I usually upgrade mine once a year and sell the old one on Ebay. The whole system get a refresh every 3 yrs or so.
    Laptop on the other hand are totally different story. My XPS 17 with 650m going to be useless in a year for gaming and it's not even worth selling it back out on ebay.
    Reply
  • Sadrak85 - Tuesday, September 10, 2013 - link

    Don't forget cheapskates (the only reason I overclock is so I don't have to buy the next model up) and people who own comfortable chairs and ergonomic keyboards. Reply
  • hoboville - Monday, September 9, 2013 - link

    One important factor that cannot be expressed enough with regards to laptops--especially since you mentioned college--laptops get stolen a lot. You'd be hard pressed to find the same to be true with a desktop PC. And if you're a gamer with a $2000 laptop...not fun to contemplate.

    I refurbish and repair computers for a living, and people break laptops all the time (can't tell you how many times people have spilled beverages on them). Repairing them is rarely an option, if the customer has cracked the screen or messed up the keyboard and it's not under warranty...their options are very limited.

    There's hidden costs to mobility and all-in-one solutions, performance is just one aspect. Besides, when was the last time you dropped your desktop PC accidentally?
    Reply
  • vpk24_astro - Monday, September 9, 2013 - link

    It'd be really interesting to see how far we are from discarding laptops entirely in favor of tablets. The thermal constraints - the only ones set in stone, should be the only limiting factor in the long run. Fortunately, the thermal envelope that laptops have to run in is very comparable to what tablets have to play with (factor of 2X or so in heat generated). How many generations before we see tablets as powerful as today's laptops? Are there any variants of desktop linux that have been ported to a tablet? Can I plug a keyboard, mouse, HDD and monitor into a tablet all at once? Reply
  • Selbatrim - Monday, September 9, 2013 - link

    This is pretty much the same argument. You wonder when a tablet will be better than the CURRENT laptops but by then the laptop has progressed further and you still get more for less.

    The question seems to be when will the form factor no longer represent any impact on price or performance? For the mainstream this may perhaps happen in the next 10-15 years, but for the enthusiast it will take so long it is not really possible to contemplate.

    Again, I just looked at this in a fleet refresh and the approximate priceratios we came up with was this:

    1 tablet(full x64 specs here, not arm etc) for the price of 2 laptops or 4 desktops. Will this ratio change? Perhaps. But if you are looking at value for money the foreseeable future is desktop over laptop over tablet.
    Reply

Log in

Don't have an account? Sign up now