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whats ddr2 ddr 3 ddr 4

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whats ddr2 ddr 3 ddr 4 on video cards is it ram ?

and how do you tell if a mobo suports a ddr2 ddr3 video card agp

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DDR2 Video Ram will usually perform rather poorly.
Try and avoid video cards with DDR2 if you can find the same card for a close price with DDR3. The performance difference will be significant.

Message quoted 1 times

Reply to zenmaster

Not always, i mean i would rather get a 7600gs ddr2 then a x1600 pro ddr3.

Reply to cristip60

The 7600gs and 1600pro are not the same card.

Many cards ship with both DD2 and DDR3 variants.
Basically the card manufacturer tryng to slip something by uninformed consumers and make a few extra dollars.

Example: The XFX Card will destroy the EVGA card.
http://www.newegg.com/Product/Prod [...] 6814130099
http://www.newegg.com/Product/Prod [...] 6814150233

I was actually a bit shocked that EVGA would put out such a card.

Reply to zenmaster

Assuming identical clock speeds, there will be no performance difference.

However, DDR3 can run MUCH faster than DDR2. At higher clockspeeds, yes, there will be a huge difference (assuming all else being equal - same bitwidth of the memory bus, same GPU and GPU clocks, etc).
There are other factors like memory latency, too.

But the bottom line is that a DDR2 7600 GT will run much, much slower than a DDR3 7600 GT.

Message edited by Cleeve on 09-07-2007 at 05:37:01 PM

Reply to Cleeve

what he may have meant was that at low clock speeds, ddr2 vs ddr3 makes no difference, however a 7600 gt is obviously fast enough to make that difference noticable (although if thats the case I don't know what wouldn't make a difference) unless what he meant was that the difference in memory somehow allows higher clock speeds

Message edited by spuddyt on 09-08-2007 at 02:29:37 PM

Reply to spuddyt

If you look at the linked cards, the DDR2 memory runs at 800mhz.
The DDR3 Memory runs at 1400Mhz.
If the DDR3 Memory only ran at 800Mhz you would not see a difference.

However, IRL, you will always or nearly always find DDR3 clocked faster.

Reply to zenmaster

MrsBytch wrote :

You contradicted yourself, In the first sentence you said there will be no perfromance difference. Then in the last line you say the one with the DDR3 will be much much faster.

no I didn't. At identical speeds there will be no performance difference.

However, in the real world, the 7600 GT DDR2 has far lower clock speeds than the 7600 GT GDDR3. About 40% less speed, in fact. This causes a massive performance hit. Your ddr2 7600 GT is really a 7600 GS with a higher core clock.

It still comes down to the clock speeds. DDR2 is usually far slower than GDDR3.

Message edited by Cleeve on 09-07-2007 at 10:02:33 PM

Reply to Cleeve

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