Will i7 920 bottleneck a gtx2070

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Racleborg
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Will i7 920 bottleneck a gtx2070

Post by Racleborg » Mon Feb 18, 2019 4:25 pm

Hi
I'm looking to do a partial upgrade by changing my gtx660 to a gtx2070 running on an i7 920. Will I get full benefit from the upgrade without bottlenecking?
Thanks

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Dade
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Re: Will i7 920 bottleneck a gtx2070

Post by Dade » Mon Feb 18, 2019 4:34 pm

Racleborg wrote:
Mon Feb 18, 2019 4:25 pm
I'm looking to do a partial upgrade by changing my gtx660 to a gtx2070 running on an i7 920. Will I get full benefit from the upgrade without bottlenecking?
An i7 920 is a very old CPU but it affects only you pre-processing time, GPU rendering is pretty much a stand alone process not affected by the CPU performance. For safety, you may want to set the hybrid rendering CPU threads count to 0 just to not let you new GPU ever wait for a CPU response.

The i7 920 is a 10 years old CPU so you may want to check your motherboard PCIe, power supply specs, etc. It shouldn't be a problem but better safe than sorry.
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Racleborg
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Re: Will i7 920 bottleneck a gtx2070

Post by Racleborg » Mon Feb 18, 2019 5:47 pm

Dade

Thank you

CodeHD
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Re: Will i7 920 bottleneck a gtx2070

Post by CodeHD » Mon Feb 18, 2019 6:22 pm

I just ordered a completely new system with a 2070 yesterday, and I believe I have seen in some poeples signtaure here that they also have a 2070.

So I would have suggested to do "benchmarks" with some LuxCore scenes if you are in doubt, but Dades statement is probably true and the difference between two 2070 models might be larger than the impact from the CPU bottleneck ;) But yeah, if in doubt, we can compare.
Other than that, a quick search showed that there are other people running a 920 + RTX combination, so it should work in general...
Last edited by CodeHD on Mon Feb 18, 2019 6:32 pm, edited 1 time in total.

Racleborg
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Re: Will i7 920 bottleneck a gtx2070

Post by Racleborg » Mon Feb 18, 2019 6:24 pm

CodeHD

Thank you

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epilectrolytics
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RTX 2070

Post by epilectrolytics » Mon Feb 18, 2019 9:47 pm

I have one and am very happy with it.
At full speed (slightly overclocked 1740 MHz) it sucks 140-160W Power, very efficient.

Warning: The official Blender 2.79b required for LuxCore will not recognise an RTX in Cycles.
That needs a newer build with RTX support (newer CUDA version) which will not run LuxCore.
So two versions of Blender 2.79 are needed and saving a file with the newer and opening with the former might cause problems.
MBPro 15" 16GB i7-4850HQ GT750M, MacOS 10.13.6 & Win10Pro PC 16GB Ryzen 2700X, RTX 2070, GTX 1060

CodeHD
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Re: RTX 2070

Post by CodeHD » Mon Feb 18, 2019 10:57 pm

epilectrolytics wrote:
Mon Feb 18, 2019 9:47 pm
I have one and am very happy with it.
At full speed (slightly overclocked 1740 MHz) it sucks 140-160W Power, very efficient.
Pretty much the reason (other than wanting to try out the RTX in games myself) why I didn't consider AMD. The additional power consumption will just annihilate any price/performance advantage you may find, for my expected life cycle and usage at least.
epilectrolytics wrote:
Mon Feb 18, 2019 9:47 pm
Warning: The official Blender 2.79b required for LuxCore will not recognise an RTX in Cycles.
That needs a newer build with RTX support (newer CUDA version) which will not run LuxCore.
So two versions of Blender 2.79 are needed and saving a file with the newer and opening with the former might cause problems.
Good to know, thanks for the heads up! :)
I knew they had added RTX support but I wasn't aware that it wasn't in the official build yet.

Racleborg
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Re: Will i7 920 bottleneck a gtx2070

Post by Racleborg » Tue Feb 19, 2019 10:00 am

epilectrolytics: Thank you.

CodeHD
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Re: Will i7 920 bottleneck a gtx2070

Post by CodeHD » Thu Feb 21, 2019 8:21 pm

My new System is here now and running :)
A first rendering says the new i5-9600K + RTX 2070 is 7x as fast as my previous i7-4800MQ + GTX 765M combination. Good investment it seems :D
(I didn't install the cycles build yet. Might not even bother and just try the 2.8 beta directly and get used to the new version, because I probably won't really need it anytime soon...)

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