GPU upgrade

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GPU upgrade

Postby acasta69 » Thu Dec 17, 2015 3:30 am

Hello All

at the moment I have a graphics card totally unsuitable for Lux, and I've finally decided to upgrade.
I've seen that two options, both in my bugdet and with very similar prices, could be R9 390 8GB and GTX 970 4GB.
I had a look at LuxMark site: the 970 performs well it seems. The 390 does not appear as such, but could be the same HW that appears under other names maybe?...

The 390 is good for the memory amount, the 970 for the very low power consumption (but a power supply replacement is needed in any case).

Could you please give any advise or suggestion?

Thanks a lot,
Ale
Windows 10 64 bits, i7-4770 3.4 GHz, RAM 16 GB, GTX 970 4GB v382.05
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Re: GPU upgrade

Postby Dade » Thu Dec 17, 2015 4:12 am

acasta69 wrote:I had a look at LuxMark site: the 970 performs well it seems. The 390 does not appear as such, but could be the same HW that appears under other names maybe?...


This should be the 390 results: http://luxmark.info/view_search_results ... 0Engine/40
And this the 970: http://luxmark.info/view_search_results ... X%20970/13 (note: short in reported results)

I think that the 390 outperforms the 970 (probably by a small margin). I have noticed, especially with Lux latest sources/drivers that my GTX980 is starting to, sometime, outperform my AMD R9 290X however the 290X is still the winner most of the times (it should be a battle comparable to 390 Vs. 970).

Than, you have to consider the sexy bonus of the 8GB and the prices. If AMD wins performance, memory and price battles, I would go for the AMD GPU. If the prices are very near, I would seriously consider the 970 as a "safe" bet.
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Re: GPU upgrade

Postby acasta69 » Thu Dec 17, 2015 5:04 am

Thanks Dade.

Dade wrote: I would seriously consider the 970 as a "safe" bet

What do you mean here? Are you expecting better performance in future due to driver upgrades?

The 390 is quite appealing also because of the 8GB, but its actual price can vary a lot depending on the manufacturer and reseller, and power consumption is really big (sapphire declares 375 W).
On the other hand, I could not really need the 8GB, and a R9 380 4GB is much cheaper. How do you value this one? Could please link Luxmark results for this also?
Regarding the 970, I've read something about the amount of memory really available, which is smaller than the declared 4 GB.
Windows 10 64 bits, i7-4770 3.4 GHz, RAM 16 GB, GTX 970 4GB v382.05
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Re: GPU upgrade

Postby Dade » Thu Dec 17, 2015 5:19 am

acasta69 wrote:What do you mean here? Are you expecting better performance in future due to driver upgrades?


NVIDIA has something like the 80% of the discrete GPU market share: the bigger always win, it is the safer bet.

acasta69 wrote:On the other hand, I could not really need the 8GB, and a R9 380 4GB is much cheaper. How do you value this one? Could please link Luxmark results for this also?


The only difference GPU memory does is if you can render your scene or not: once you have enough, it doesn't matter if you have more, it ends to be unused.

acasta69 wrote:Regarding the 970, I've read something about the amount of memory really available, which is smaller than the declared 4 GB.


Yes, the 970 has only something like 3.6GB of ram running at full speed, the other 400MB are a lot slower if you end to use them. It is due to how the hardware is configure (i.e. it is a 980 with some part of the chip disabled/not working).
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Re: GPU upgrade

Postby sharlybg » Thu Dec 17, 2015 7:56 am

another about gtx 970 while rendering !
The real GPU comsumption in rendering is around 250w use GPU -Z to see !
i7 6700k + 32 Gb DDR4 + 2X R9 390 sapphir nitro.
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Re: GPU upgrade

Postby acasta69 » Thu Dec 17, 2015 12:36 pm

In the end I've decided for the GTX 970, considering I should not need so much memory at the moment...
Thanks a lot for the information and suggestions! :)
Windows 10 64 bits, i7-4770 3.4 GHz, RAM 16 GB, GTX 970 4GB v382.05
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