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Worth upgrading to a 40 lane CPU and board?

post #1 of 24
Thread Starter 
Today I build in my 950 pro nvme and a couple of other disks. Due to my board/cpu I dropped down to 8x and 4x in my SLI setup, my nvme runs only at 4x instead of 8x (1500mbs read vs 2500mbs read) and my sound card on the pcie 1x does not work any longer because the nvme ssd is using the lanes.

What do you think, is it worth upgrading to a 5830k or 5960x/6900k ? I am only gaming on my system.

Also, what I just saw, could it be that my SLI cannot be used at full capacity with 8x and 4x? I am seeing only 50%-60% usage in Witcher3, while before with 8x/8x it was 99%.
Edited by dante`afk - 7/16/16 at 6:48pm
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post #2 of 24
There is no CPU called 5830K you must mean the 5930K, and why get a 6900K when the 6850K is half the price and also give you 40 PCI-E lanes.
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post #3 of 24
Quote:
Originally Posted by dante`afk View Post

Today I build in my 950 pro nvme and a couple of other disks. Due to my board/cpu I dropped down to 8x and 4x in my SLI setup, my nvme runs only at 4x instead of 8x (1500mbs read vs 2500mbs read) and my sound card on the pcie 1x does not work any longer because the nvme ssd is using the lanes.

What do you think, is it worth upgrading to a 5830k or 5960x/6900k ? I am only gaming on my system.

Also, what I just saw, could it be that my SLI cannot be used at full capacity with 8x and 4x? I am seeing only 50%-60% usage in Witcher3, while before with 8x/8x it was 99%.

Don't forget that mainstream quad cores have 16 lanes, but the 5820k and 6800k have 28 lanes. That is still a 12 lane improvement. You don't need to go balls to the wall for 40 lanes. You could also buy a new motherboard with a PLX chip to give you more lanes at the most efficient cost. thumb.gif
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post #4 of 24
Thread Starter 
Yea, but would I see any significant increase in gaming performance upgrading from my 4790k @ 4.8ghz if I go to 6800k or 6850k? The costs would be up to 1000$+

Worth yes/no?
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post #5 of 24
Gaming? No
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post #6 of 24
SLI runs at minimum of 8x so yes only one card is being used.
post #7 of 24
I don't think you would see any significant decrease if that's what you're worried about. You definitely wouldn't see a significant increase.

Have you tried running just one card? That should be plenty for 1440p.
post #8 of 24
40 lane? No, it's usually a waste of money. 28 lane? Yeah sure. You should be able to have SLI running at x8/x8 (99% as good as x16/x16), the SSD at x4, and the sound card in an x1 slot from the chipset (which has its own PCIe lanes). I'm not sure it's a smart idea however. A 4790K and a 5820K are both Haswell. The 5820K has more cores and memory bandwidth, but it's not exactly an upgrade if you don't need the cores, and most games don't need them. The Broadwell 6800K would technically be an upgrade, but don't count on overclocking much - Broadwell simply does not handle high frequencies well.

Hmm, have you considered Skylake and a 6700K instead? The Z170 chipset has 20 PCIe 3.0 lanes available (compare to your Z97's 8 PCIe 2.0 lanes) that can run in up-to-x4 links. The CPU still has 16 lanes that can be split into x8/x8 for SLI, but the SSD should get full bandwidth using a chipset-based slot. For example, this board. The GPUs go in the two x16 slots with aluminium covers (from the CPU, @ 3.0 x8 when both are used), the SSD goes in the bottom plastic x16 slot (from the chipset @ 3.0 x4), and the sound card can go in the very top slot (also chipset @ 3.0 x1).

But I'm not sure you even need to upgrade. Looking at your motherboard (the Maximus VII according to your sig), it has more or less the same layout as the Z170 board I linked. You can stick the GPUs in the red x16 slots for SLI running at x8/x8 (which, incidentally, is the minimum Nvidia allows - x4 slots can't be used with SLI). The black x16 slot is a PCIe 2.0 x4 link from the chipset rather than the CPU and, ideally, should let your SSD run at 2GB/s. This is less than the 4GB/s it can reach in theory, but you're never going to reach those speeds in general. SSDs and NVMe are about random speeds rather than sequential, and these rarely exceed ~200MB/s.
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post #9 of 24
Thread Starter 
Yea, one is plenty but not for The Division, Rainbox 6 Siege or Tomb raider at max settings smile.gif

I'll get probably just a new Z97 and see if that fixes that. I suggest the Motherboard has one off and use that until I get it repaired through Asus RMA.

Just was considering if it is worth just getting a new Z97 or go straight to Z170 or X99
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post #10 of 24
Do you absolutely have to play with maxed settings? Often times tuning down a setting or two will get you the frame rates you want. If that's a compromise you're not willing to make, your options are either wait for a more powerful video card to hit the market or get a motherboard that has enough PCI-e lanes available for your add-in cards. Going to Z170 should be enough as the chipset has 20 PCI-e 3.0 lanes available compared to 8 PCI-e 2.0 on Z97. This should allow you to run x8 x8 SLI along with your NVMe SSD and PCI-e sound card without any compromises. Doing this research made me realize X99 only has 8 PCI-e 2.0 lanes as well. I guess I'll no longer be considering X99 as a possible upgrade route.

You should be able to sell your motherboard and processor to recoup some of the cost of upgrading to Skylake.
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