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I'm building a new PC and was looking at the graphic cards here are the 2:

The cheaper has: 1536MB (4008Mhz)

The more expensive has: 3072MB GDDR5 Memory (1008MHz)

So the second one has more memory but less processing speed?

What is the benefit of having more memory?

UPDATE: didn't mean this to be a purchase recommendation explicitly, the question is more: whether the less memory 1536MB at a higher speed is better 4008Mhz or high ram with low speed: 1008MHz

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closed as too localized by sblair, Shiki, soandos, 8088, Nifle Sep 7 '11 at 8:29

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

No shopping questions allowed here – wizlog Sep 6 '11 at 22:38
When you start to mention exact prices ex. $30 ("They are the same series cards and the price difference is only about $30") you start to cross a line. – wizlog Sep 6 '11 at 22:47
removed the price, not meant to be a purchase question. was wondering whether the less memory 1536MB at a higher speed is better 4008Mhz or high ram with low speed: 1008MHz – Saad Sep 6 '11 at 22:52
Sorry to say that the pages you linked have you confused. If you look at the specification section, memory speed is identical and 4008 Mhz (Effective) for both cards, which means 1002Mhz at 4-transfers per clock. – Itai Sep 6 '11 at 22:54
Its nice that you removed it, now I think we can all take a better look. A question could be closed as shopping, regardless of asker's intent. Just keep that in mind, and be careful. – wizlog Sep 6 '11 at 22:55
up vote 3 down vote accepted

I don't think the memory amount will count above 1024mb. At least, today ... even 512mb is sufficient (at least I never seen anything want more memory).

When you try to decide between two cards, look for Reviews, independent tests. Numbers, scores.
That's what helps you to get the better (i.e.: faster) card.

Edit: IMO since the ASUS card got some OC, thus overscoring the other card by some % in performance, is better. Memory won't help you in games or benchmarks, since 1gb is more than enough. (Still IMHO.)

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Only a handful of applications and games are ever likely to see a consistent difference between the two.

Between more memory and faster processing, I would choose faster processing. Actually, if there was a choice, I would choose faster memory since that is the most common bottleneck. However, the exact one depends on the app but it would take a whopping amount of textures or GPU-processing on huge data to use that much memory.

At this point, the difference is so minor I would save the $30 or invest it in a better keyboard or mouse which you are much more likely to notice a difference :)

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It depends on the architecture, I believe.

Personally, I think these cards are close enough other features that I'd go for the one with the higher memory.

From 772Mhz to 816Mhz core clock speed there's just not a whole lot of gain, while the memory is double.

UPDATE for comment: Because the stats are layed out differently for the different cards, it took me a bit to find the different clock speeds.

Most modern GPUs, because they are purpose built for the types of calculations in graphics applications, do not need to be nearly as high frequency (Mhz, Ghz) as desktop CPUs, which are general purpose and thus not quite so "good" at one particular thing. So, the 4008Mhz right away could not have been the GPU core speed.

The 4008Mhz (effective) rate is the memory frequency. This is a bit of a misnomer though. GDDR5 is a very high bandwidth DDR (Double-Data-Rate) memory architecture that, due to it's capability of handling two instructions per clock cycle plus a wider bus is labeled or advertised at four times it's actual core speed. I may be off here. Someone please correct me if I'm wrong.

Thus, 4008Mhz is really only a more pedestrian 1Ghz with multitasking, essentially, which isn't all that great when it comes to GDDR. The fastest GDDR currently clocks in at more /than 7Ghz effective (1.75Ghz real).

You'll find the specs on the ASUS Matrix card show this: In the specifications tab of the product page, the Memory clock is "4008Mhz (1002Mhz GDDR5)".

The EVGA only notes the first value, which is identical at 4008Mhz and adds the label "(effective)" to clarify.

In looking for the GPU speed, look for terms like "Core clock", "GPU", "Engine clock", and so forth. These will indicate the speed at which the GPU on the cards run.

In this case, the EVGA product says "772Mhz GPU" and the ASUS "Engine Clock 816Mhz".

Standardization would be great, but so long as you're careful and know what to look for it's not too hard to find out which numbers ought to be compared.

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if 772 and 816 are core clock speed then what is the 4008Mhz, and 1008Mhz? – Saad Sep 6 '11 at 22:47

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