• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

This is bad for multi GPUs - Intel Core i7-5820K Features Fewer PCI-Express Lanes After All

Kaapstad

Kaapstad

Kaapstad

Man of Honour
Joined
21 May 2012
Posts
31,953
Location
Dalek flagship
It turns out that our older report suggesting that the most affordable of Intel's new Core i7 "Haswell-E" HEDT processors will feature a slimmer PCI-Express root complex, even if it gives you 6 cores at a [hopefully] sub-$400 price-point, holds true, after all. Intel's wacky approach to its latest HEDT processor lineup was confirmed by leaked manuals of Gigabyte's socket LGA2011-3 motherboards, based on the Intel X99 Express chipset. The manual confirms that while Intel's $500-$750 Core i7-5930K and >$1,000 Core i7-4960X offer bigger 40-lane PCI-Express Gen 3.0 root complexes; the Core i7-5820K features a narrower 28-lane one. This means that multi-GPU configurations on systems running the chip won't be too different from those on LGA1150 "Haswell" platforms.

On motherboards with, say, three PCI-Express 3.0 x16 slots, the i7-5930K and i7-5960X will let you run two slots at full x16 bandwidth, and a third slot at x8. On systems with the i7-5820K, the second slot won't go beyond x8, and the third one will cap out at x4. On boards with four slots, one of them will run out of bandwidth. The trade-off for this narrower PCI-Express interface is the fact that you're getting six "Haswell" cores, twelve logical CPUs enabled with HyperThreading, about 12 MB of L3 cache, and a quad-channel DDR4 memory interface, at a price-point not too far off from the Core i7-4790K. So for enthusiasts with no more than two high-end graphics cards, the i7-5820K could provide an attractive gateway option to Intel's new HEDT platform. You can find the leaked manuals in this thread.
Click to expand...

http://www.techpowerup.com/204387/intel-core-i7-5820k-features-fewer-pci-express-lanes-after-all.html

Having used 4K with more than 2 GPUs I have found that performance can fall off a cliff in some games if there is any restriction in PCI-E bandwidth.
 
That's a disappointment, looks like people will have to pay full whack if they want to use more than two gpu's then. Probably just a way for them to make more money and commence milking.
 
LtMatt said:
That's a disappointment, looks like people will have to pay full whack if they want to use more than two gpu's then. Probably just a way for them to make more money and commence milking.
Click to expand...

FrankJH said:
Double premium time - absolutely shocking move by Intel

(i7 being the original premium - as if ~£400 isnt bad enough)
Click to expand...

Hmmm, it seems the trade off is rather fair though. And going by these forums alone, the amount of people using more than 2 cards is rather slim...
 
I think it is disgusting as the old i7 920 has more PCI-E lanes.

I know they are PCI-E 2.0 but it is a joke if the 5820K can not even match the configuration.
 
They needed to cripple the CPU some how, or they'd see it as damaging their other products.
It's progression and then a back step.

But in pcie bandwidth, the 5820 does match the old i7 920 set up. Were the lanes not in the board in the i7 920 days though? I can't remember at all.
 
It's not very nice to hear, but i'm sure it's not going to affect many (if any) people.

It'll be fine for 1 GPU and most probably 2. Any more, then you're likely to have the 5930K or better anyway.
 
Will this have any impact on 2 x High end GPU's and 4K?

I don't plan on ever going more than a 2 card SLI setup, so if not and the price is right no complaint from me.
 
It's the low end of the new Haswell-E processors right?

It's still more than the non Haswell-E chips offer and will only really affect those running Multi-GPu configurations.

Is it what everybody wants? No. Is it "shocking" or "unfair". Not really. Sure, everyone wants everything for nothing but the options you want are available....just not in the cheapest form you desire.

It's probably better to think of the line-up and the 5820K not as "It;s the cheapest to get all of the goodies Haswell-E offers" but more "The 5820K is targeted at a different audience"

Do all people with a genuine need for 6 cores and 12 logical threads need as much PCI-E 3.0 bandwidth as possible? No. Many might even run it without a GPU at all.

There are another 2 models available for those who want to run huge GPU setups with as much bandwidth as possible.
 
So 5820k and 2 top end next gen cards. Will the lanes be fine ?
I cant see me going more then 2 cards and my x58 is getting long in the tooth,, have been debating upgrading next year to x99 or x79 cast offs
 
you're getting six "Haswell" cores, twelve logical CPUs enabled with HyperThreading, about 12 MB of L3 cache, and a quad-channel DDR4 memory interface, at a price-point not too far off from the Core i7-4790K
Click to expand...

Is all a lot of people care about, a 6 core 12 thread monster that will run two GPU's just as well as Z97 will be ideal for most people, a lot of people prefer single GPU as well, and those are usually the ones with less budget so 5820K makes perfect sense.

For everyone else there is 5930K and 5960X, everyone is a winner imho.

I'm going 5820K as I have no intention of ever using dual GPU's again lol (Except for benching).
 
triss said:
So 5820k and 2 top end next gen cards. Will the lanes be fine ?
I cant see me going more then 2 cards and my x58 is getting long in the tooth,, have been debating upgrading next year to x99 or x79 cast offs
Click to expand...

Of course it will :confused:

Vanilla Haswell offers less PCI-E 3.0 bandwidth and copes just fine. It's not like overnight GPUs are going to require bandwidth that significantly exceeds what even PCI-E 3.0 8x or even 4x currently offers.
 
Boomstick777 said:
Is all a lot of people care about, a 6 core 12 thread monster that will run two GPU's just as well as Z97 will be ideal for most people, a lot of people prefer single GPU as well, and those are usually the ones with less budget so 5820K makes perfect sense.

For everyone else there is 5930K and 5960X, everyone is a winner imho.

I'm going 5820K as I have no intention of ever using dual GPU's again lol (Except for benching).
Click to expand...

A 5820k will be fine for dual gpu's. Out of interest, why not ?
 
Bit of a Dick move but they had to do something to show difference between the 5820 & 5930 I suppose.

Would have preferred them just to leave it on a lower core count like the 3820/4820 tbh, soldered, ddr4 compatible 4790k capable of natively running 3 high end cards would be fine.
 
You must log in or register to reply here.
Back
Top Bottom