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Haswell-E Core i7-5820K Will Only Have 28 PCI-Express Lanes

By - Source: TPU Forums | B 33 comments

Leaked Gigabyte X99 motherboard manuals appear to confirm that the Core i7-5820K will only be able to address 28 PCI-Express lanes, in contrast to the 40 lanes of its superior counterparts.

As it turns out, and as we already suspected, not all of the Haswell-E CPUs will have the same number of PCI-Express lanes. Both the Core i7-5960X and the Core i7-5930K will be able to address 40 PCI-Express lanes, but the cheapest Core i7-5820K will only have access to 28 lanes. TechPowerUp forum member "623" has seemingly confirmed this through leaked manuals of Gigabyte's X99 motherboards.

CPU

Cores/Threads

Frequency

L3 Cache

PCI-Express Lanes

TDP

Expected Price

i7-5820K

6 / 12

3.3 GHz

12 MB

28

140 W

$400

i7-5930K

6 / 12

3.5 GHz

15 MB

40

140 W

$600

i7-5960X

8 / 16

3.0 GHz

20 MB

40

140 W

$1000+

Of course, this shouldn't come as too much of a surprise. Being able to grab a 6-core Haswell-E processor for the rumored price of $400 makes for a good deal, and there must be a concession made somewhere. While the Core i7-5960X and the Core i7-5930K will be able to address triple-GPU configurations with 16-16-8 lanes, the Core i7-5820K will only manage a 16-8-4 configuration, at best. This leaves the third GPU quite choked, and if you have any additional PCI-Express devices operating over lanes that are wired directly to the CPU, you will run into even more issues. We would have hoped that the i7-5820K would be able to address the slots in an 8-8-8 configuration; however, the manuals posted make no mention of such a configuration. Dual-GPU configurations won't present a problem, but for anything more than that you're going to want a Core i7-5930K or above.

Of course, you can't really ding Intel for doing this. The company will be offering a 6-core chip for hopefully under $400, and if you're interested in a multi-GPU setup that needs the extra PCI-Express lanes, you can probably afford the extra $200 for the upgrade to the Core i7-5930K anyway. Thus, if you're already playing around with the thought of acquiring a Haswell-E system with three or more GPUs, you'd better start adjusting your wishes or your budget.

Follow Niels Broekhuijsen @NBroekhuijsen. Follow us @tomshardware, on Facebook and on Google+.

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Top Comments
  • 11 Hide
    squirrelboy , August 21, 2014 2:11 PM
    "and if you're interested in a multi-GPU setup that needs the extra PCI-Express lanes, you can probably afford the extra $200 for the upgrade to the Core i7-5930K anyway.

    No, cause you just spent all your money on a triple GPU setup ^^
Other Comments
  • 11 Hide
    squirrelboy , August 21, 2014 2:11 PM
    "and if you're interested in a multi-GPU setup that needs the extra PCI-Express lanes, you can probably afford the extra $200 for the upgrade to the Core i7-5930K anyway.

    No, cause you just spent all your money on a triple GPU setup ^^
  • 2 Hide
    maroon1 , August 21, 2014 2:13 PM
    12MB L3 for i7-5820K ?

    All the other sources I read say that it has 15MB L3
  • Add your comment Display all 33 comments.
  • 0 Hide
    CaedenV , August 21, 2014 2:15 PM
    I would love something like this for my next build! Get one of these in a little mATX box that can only fit one GPU and you would never miss the extra PCIe lanes. If Intel is going to continue focusing on performance per watt instead of increasing raw horsepower then the only way up will be to go after CPUs with more cores anyways.
  • 4 Hide
    bluestar2k11 , August 21, 2014 2:37 PM
    I was planning to have the 4930k in my next computer for the coming year, but I think I'll throw this 5820 in instead^^ I want a CPU with 6 cores and HT, I figure it would last me like the next 5-7 years, with overclocking capability.

    And should games start being ported with greater CPU requirements from consoles threading, having 6 actual cores with 12 threads available should really help. I'm just not sure I'm sold on the DDR4... great speeds and bandwidth, but horrible timings. Might be able to be overclocked though... maybe... Will this CPU support quad channel memory like the 4930?
  • 4 Hide
    dextermat , August 21, 2014 2:43 PM
    Holding on my core i5-2500k for right now, will be waiting for 2nd generation with ddr4 support.

    They are just splitting hair in four here....
  • 5 Hide
    SirKnobsworth , August 21, 2014 2:53 PM
    Why would then not enable 8-8-8? 8 lanes should be plenty for any single GPU.
  • 3 Hide
    lp231 , August 21, 2014 2:57 PM
    So those 12 PCIe lanes pieces of strings cost an extra $200?!

  • 4 Hide
    oxiide , August 21, 2014 3:30 PM
    Quote:
    So those 12 PCIe lanes cost an extra $200.

    This is already absurdly expensive hardware, considering how well the mainstream stuff performs. If you want to get the most for your money, you aren't looking at triple GPU setups anyway.
  • 0 Hide
    Chris Droste , August 21, 2014 3:34 PM
    im actually kinda surprised a vendor hasn't done a DDR3 x99 board. with most OC kits you'll get the same bandwidth and tighter timings, so the only real benefit comes down to voltage, but even then there's a few low-voltage DDR3 kits out there and if you're going multi-GPU, 6core, quad-channel memory, something tells me you're not going to flip out over 0.45v. sure there's x79 boards but are any of them reporting haswell-E support?
  • 2 Hide
    lp231 , August 21, 2014 3:52 PM
    Quote:
    Quote:
    So those 12 PCIe lanes cost an extra $200.

    This is already absurdly expensive hardware, considering how well the mainstream stuff performs. If you want to get the most for your money, you aren't looking at triple GPU setups anyway.


    It's not about mutli GPU setups, some might need to install some other PCIe cards and when that is installed, does your PCIe lanes for your GPU still get reduced down to say from x16 to x8?
  • -5 Hide
    tryingmybest , August 21, 2014 4:12 PM
    This is a stupid move , I was expecting the new chips to have 64 lanes for quad 16x pcie , or at least the X version to be 64 lanes m and the rest 40 lanes.

    And we ended up with a stupid 28 lanes , not even 32 lanes to give you full 16x,16x

    Whos the idiot working at intel who suggested this 28 lanes crap?

    And finally , I was expecting the new chip to start from 8 cores and end at 12 cores . The xeons already have 15 cores .

    So the entry level 8 and 10 cores , and the x 12 cores . With the price tag of , $400,600,1000.

    shame on you AMD for letting intel steal our money for nothing new . We had 6 cores with 40 lanes for yeaaaaaaars , this new generation just offered ddr4 thats it .
  • 2 Hide
    Joseph DeGarmo , August 21, 2014 4:16 PM
    remove post
  • 1 Hide
    tryingmybest , August 21, 2014 4:30 PM
    Quote:
    There's always a catch behind budget prices like that and this is clearly one of them. I knew that the 5820k is a $400 6-core CPU for a reason. So I figured that the best way around the PCI-E limits of this CPU is using dual GPUs, such as the R9-295X2 or GTX TITAN Z, correct? But this would be the ideal CPU for those using PCs for extreme rendering projects and only interested in single GPUs or 2-way SLI or crossfire.


    The reason should been , six cores are years old now and we should price the 8 cores 600$ and the X be 12 cores for 1000$. Intel are greedy.
  • 2 Hide
    soldier44 , August 21, 2014 5:27 PM
    Waiting for broadwell with native 8 cores in K version next year.
  • 3 Hide
    Emanuel Elmo , August 21, 2014 5:43 PM
    Quote:
    This is a stupid move , I was expecting the new chips to have 64 lanes for quad 16x pcie , or at least the X version to be 64 lanes m and the rest 40 lanes.

    And we ended up with a stupid 28 lanes , not even 32 lanes to give you full 16x,16x

    Whos the idiot working at intel who suggested this 28 lanes crap?

    And finally , I was expecting the new chip to start from 8 cores and end at 12 cores . The xeons already have 15 cores .

    So the entry level 8 and 10 cores , and the x 12 cores . With the price tag of , $400,600,1000.

    shame on you AMD for letting intel steal our money for nothing new . We had 6 cores with 40 lanes for yeaaaaaaars , this new generation just offered ddr4 thats it .


    fuckin hit the nail on the head. Intel was always greedy. I think we all knew this but they have solidified there lead for so many years, now they can chill and take our money.

    I am on sandy bridge-e. Was thinking of going with haswell but it looks like I am holding off for more.
  • 2 Hide
    tului , August 21, 2014 7:25 PM
    Quote:
    Quote:
    There's always a catch behind budget prices like that and this is clearly one of them. I knew that the 5820k is a $400 6-core CPU for a reason. So I figured that the best way around the PCI-E limits of this CPU is using dual GPUs, such as the R9-295X2 or GTX TITAN Z, correct? But this would be the ideal CPU for those using PCs for extreme rendering projects and only interested in single GPUs or 2-way SLI or crossfire.


    The reason should been , six cores are years old now and we should price the 8 cores 600$ and the X be 12 cores for 1000$. Intel are greedy.


    I second this. Pricing the same, 6/12 8/16 12/24(or 10/20) cores instead of the way it is now.
  • 1 Hide
    Shin-san , August 21, 2014 8:58 PM
    Clock speed seems a little low compared to Devil's Canyon, but who knows? The efficiency is going to be higher
  • 1 Hide
    oxiide , August 21, 2014 9:15 PM
    Quote:
    Clock speed seems a little low compared to Devil's Canyon, but who knows? The efficiency is going to be higher


    Conservative stock clocks may indicate loads of overclocking headroom, to be optimistic about it. The Devil's Canyon i7-4790K comes stock at a relatively impressive 4 GHz, but that's basically a factory overclock.
  • 3 Hide
    IQ11110002 , August 21, 2014 9:40 PM
    If you are able to afford THREE gpu's I don't think you would be buying the low end 5820 in the first place!
    You would want the fastest cpu you can get stock then over clock it to ensure there would be no cpu bottlenecking. I think the 5930k will be the sweet spot as it was for Sandy-E with the 3930k I have now.
    Depending on how good this 5960x overclocks with those 8 cores, I may be tempted to go all out, But usually the more cores you add the less overclocks you are going to get.
    Would love to hit at least 4ghz oc on that 5960x would be worth an upgrade along with the M.2 port for 1gb/s ssd's. ddr 4 needs to improve on the timings a little though, speed is already fast enough just needs to bring the cas latency down a bit more before I really get interested.
  • 4 Hide
    crisan_tiberiu , August 21, 2014 10:54 PM
    nobody is whining about the 140W TDP of a six core CPU. OC those CPUs @ 4,3 -4,4 GHz and you get very close to 200W TDP ^^. I can remember very whel the hype that was made when AMD launched a 5 GHz CPU (8 core) with 220W TDP ^^. Shame :D 
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