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Question for the wise?

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Gregster
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Question for the wise?

Post #1 by Gregster » Fri Nov 07, 2014 10:58 am

Now I have been a basic clocking type guy for years and thought I understood clocks on the core and memory... There is a guy claiming that his 290X with Hynix ram and his 290X with Elpida ram will give 1000 GS points extra in favour of the Hynix card, at exactly the same clocks on both cards.... This can't be right surely?

Talking firestrike here btw.


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Re: Question for the wise?

Post #2 by 1Day » Fri Nov 07, 2014 11:44 am

That is correct yes.

Different ram chips will perform differently. The loud noise about the different chips and how high one will clock over the others is in some cases irrelevant. Not sure who it was but one of the Taiwanese benchers (could be Hicookie) posted up a thread showing exactly what you have described. Efficiency was better for him at 1450 with one kind of mem v 1650 of the the other.

To help make this clear, the same way that different motherboard memory chips at the same frequency perform better than others. Christian Ney did the comparison using the single sided 2800Mhz sticks as an example and tested 32mil efficiency using them. BBSE and PCS perform better on modern platforms.
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Re: Question for the wise?

Post #3 by twisted1 » Fri Nov 07, 2014 11:55 am

If I remember correctly in the case of the 290's the timings are optimized for the hynix Vram, with optimized timings the elpdia might perform better.

I have one 290 with hynix and one with elpida. The hynix one will do 1750Mhz and the elpida one wont go one mhz past 1600Mhz. Have not done any side to side comparisons at the same clocks.

It's probably a coincidence but the elpida card also looses display way earlier then the hynix card(known issue with 290/x)

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Re: Question for the wise?

Post #4 by Pulse88 » Fri Nov 07, 2014 2:11 pm

For me my hynix board gives 400 points more with hynix vs elpida when mem at same clock.(1625). That comparrison you talking about greg is when 2 users in ocuk compared a 290x(hynix) vs 290p(elpida) at nearly same clock, my guess is that xtra shaders in 290x do de rest of the gfx score. :)

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Re: Question for the wise?

Post #5 by Arne Saknussemm » Fri Nov 07, 2014 2:34 pm

Dont believe anything you hear and only half of what you see....x1000 for the internet.

If same frequency=different score then timings must be different...latencies...interaction with controler...faeries!

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Re: Question for the wise?

Post #6 by Gregster » Fri Nov 07, 2014 3:45 pm

Well I'll be.... I was expecting a couple hundred points at max and nothing quite like 1000 points. I understand slacker timings but never thought that it would result in that difference. Thanks for the info guys and you learn something new every day :D
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Re: Question for the wise?

Post #7 by 1Day » Fri Nov 07, 2014 4:29 pm

Arne Saknussemm wrote:Dont believe anything you hear and only half of what you see....x1000 for the internet.

If same frequency=different score then timings must be different...latencies...interaction with controler...faeries!



Exactly. Just like the main board memory chips allow different timings. Not always the primary either, but with Vram you can tighten or loosen timings via Vbios too. :)
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