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Should I invest in a i7-3820?

post #1 of 6
Thread Starter 
So here is the thing, besides Unigine Heaven I have not been able to utilize my 3rd card.

I remember seeing a chart that even x16/x16 PCI-E 2.0 gave som significant less fps vs x16/x16 PCI-E 3.0.
The difference was alot higher at 5760p, but even at 1080p the 2.0 gave 60fps while the 3.0 gave 67fps (so 11% increase).

Now my current mobo is 2.0 x16/x16/x8 I believe this is with help of Hydra, maybe that's the reason for "micro stuttering", if the 3820/3930k does support pci-e 3.0 (does it?) then I should be able to get pci-e 3.0 x16/x16/x8 and have better performance.

atm I'm running the 2500k@4.8ghz, looking at benchmarks OC the 3820 to 4.6-4.8ghz should be similar fps but the PCI-E lanes should help me.
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post #2 of 6
All ivy bridge cpus suport pci-e 3.0 so you could get a 3570k or 3770k and still have that feature. i would recommend one of those instead or else you will have to buy a new mobo too since the 3820 is lga 2011 vs sandy and ivy which are 1155
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by DizZz View Post

All ivy bridge cpus suport pci-e 3.0 so you could get a 3570k or 3770k and still have that feature. i would recommend one of those instead or else you will have to buy a new mobo too since the 3820 is lga 2011 vs sandy and ivy which are 1155

I still need a new motherboard with Ivy (mine is only PCI-E 2.0).
Also in theory Ivy does not give me more lanes, Ivy bridge PCI-E 3.0 8x/4x/4x = 16x PCI-E 3.0 = 32x PCI-E 2.0

My current mobo uses Lucihydra for more PCI-E lanes PCI-E 2.0 16x/8x/8x = 32x PCI-E 2.0 = 16x PCI-E 3.0
Only benefit of a Ivy bridge motherboard for 3 gpus and 16x PCI-E 3.0 lanes in total is I get rid of Hydra and have all lanes through CPU/MOBO.

If I'm going to invest in a new mobo + cpu I might aswell invest in 3820 + mobo vs Ivy bridge + mobo?
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post #4 of 6
can you wait a couple months for haswell?
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post #5 of 6
my gaming rig in my sig is an i7 3820. Upgraded from a 920... bit of an extravagance with hindsight. Thought it would cure all my problems but it didn't really.. able to get a better overclock but that was about it. And. the 3820 has its multiplier locked so you're limited to the maximum turbo multi. Still, mines comfortably at 4.5GHz and people can certainly get to 5.0GHz.

Micro stuttering is still an issue though, even with the 48 lanes of PCI-E and quad channel memory (not that it should affect it) and yes, it supports PCI-E 3.0.

I don't think data bandwidth on the PCI-E BUS is the cause of microstuttering and no current gen card came close to saturating PCI-E 2.0 anyway and the benchmarks I'd seen at 2.0 speeds was marginal between x8 and x16 anyway.

If you want me to run any benchmarks and report back just let me know, happy to help if I can

My advice would be to wait for next gen but if they'll be socket 2011 then maybe there's a justification to upgrade to a 3820 but your 2500K is plenty capable for now

the 3820 doesn't have native USB 3.0 either which is an inconvenience.
 
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by pharcycle View Post

my gaming rig in my sig is an i7 3820. Upgraded from a 920... bit of an extravagance with hindsight. Thought it would cure all my problems but it didn't really.. able to get a better overclock but that was about it. And. the 3820 has its multiplier locked so you're limited to the maximum turbo multi. Still, mines comfortably at 4.5GHz and people can certainly get to 5.0GHz.

Micro stuttering is still an issue though, even with the 48 lanes of PCI-E and quad channel memory (not that it should affect it) and yes, it supports PCI-E 3.0.

I don't think data bandwidth on the PCI-E BUS is the cause of microstuttering and no current gen card came close to saturating PCI-E 2.0 anyway and the benchmarks I'd seen at 2.0 speeds was marginal between x8 and x16 anyway.

If you want me to run any benchmarks and report back just let me know, happy to help if I can

My advice would be to wait for next gen but if they'll be socket 2011 then maybe there's a justification to upgrade to a 3820 but your 2500K is plenty capable for now

the 3820 doesn't have native USB 3.0 either which is an inconvenience.

well I have x16/x8 PCI-E 2.0, according this even x16/x16 PCI-E 2.0 is bottlenecking vs PCI-E 3.0 x16/x16.
Thats 1080p dual sli GTX680 cards.

Who knows, atm I'm not able to use the 3rd card, I might just sell that, also my motherboard uses x16 p67 and then Hydra for x8/x8, maybe I'll change my motherboard for a native P67 x8/x8 motherboard.

Don't see a good reason to spend alot of cash on Ivy bridge + high en mobo PCI-E 3.0 when for same price I get i7 3820 + mobo PCI-E 3.0.
So I'll either upgrade to 3820 or just keep my current system, maybe even sell one of the cards.
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