Haswell-E i7 5820K worth upgrading from Sandy Bridge-E i7 3930K

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nonni123

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Mar 2, 2014
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So I currently have a Sandy Bridge-E system, with an i7 3930K, 2x GTX 970's in SLI, 32GB DDR3 RAM and Asrock X79 Extreme6, and I'm thinking about selling it and upgrading to Haswell-E i7 5820K, MSI X99S SLI Plus, 32GB DDR4 RAM, and keep my 970's, I'd have to pay 200€ extra for it, is it worth it?
 
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Darkbreeze
Not really. The gains don't justify the cost. Especially right now. If you wanted to do that I'd wait until Broadwell and Skylake are released which will likely drive the price of the Haswell-E chips and X99 boards down a bit.

The 5820k actually has a lower clock speed, but a slightly higher onchip cache. Both likely provide more than enough processing power for any dual card configuration however the only real benefit I see is possibly the additional PCI lanes of the 5820k considering your dual cards. For a 5-10% performance increase, I don't see it.
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DubbleClick

DubbleClick

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Jun 16, 2014
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I wouldn't do it. Performance gain on the same clock speed will be around 10%, but you can overclock sandy-e further than haswell-e on average. Also, you would be losing 12 pcie lanes, so one 970 would be running at 8x instead of 16x, although you wouldn't notice a difference there.
 
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Darkbreeze

Darkbreeze

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Jun 24, 2014
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Not really. The gains don't justify the cost. Especially right now. If you wanted to do that I'd wait until Broadwell and Skylake are released which will likely drive the price of the Haswell-E chips and X99 boards down a bit.

The 5820k actually has a lower clock speed, but a slightly higher onchip cache. Both likely provide more than enough processing power for any dual card configuration however the only real benefit I see is possibly the additional PCI lanes of the 5820k considering your dual cards. For a 5-10% performance increase, I don't see it.
 
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Solution
Darkbreeze

Darkbreeze

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Jun 24, 2014
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How do you figure there would be a loss of PCI lanes moving to the X99 platform? The newer chips have more PCI lanes, not less.
 
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tommyducker19

tommyducker19

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May 23, 2012
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I would guess that you are using this system for more than just gaming. The upgrade is getting you a speed upgrade as well as DDR4 RAM. So it will give you more performance. What's hard to say is if you will see any difference for the money.

It really comes down to the programs you are using. If it's just for gaming, I would say it's not worth the upgrade. DDR4 is still expensive. Wait a couple of months and it should start to come down.
 
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1LiquidPC

1LiquidPC

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Oct 11, 2014
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I just did this upgrade myself(3930k @ 4.5 to 5820k @ 4.4). I'll try to write more specifics later today from my own benchmarks, ect. I'm typing this reply on my phone. One quick comparison is Cinebench R15. My 3930k @ 4.5 scored 1019. My new 5820k @ 4.4 scored 1302. These are from CPU test.
 
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RobCrezz

RobCrezz

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Mar 14, 2013
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They intentionally restricted the 5820k to 28 lanes, rather than the full 40.
 
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Darkbreeze

Darkbreeze

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Jun 24, 2014
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My bad, apparently it's the only model of the Haswell-E chip without 40 lanes and I was also unaware that any previous i7 chips HAD 40 lanes. I was under the impression that had been reserved for the server chips. Guess I got that one wrong. My applogies Doubleclick.

All the more reason though for the intial premise that the upgrade makes no sense and gains no advantage, as indicated by everyone.
 
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