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does the memory bus affect on performance?

post #1 of 10
Thread Starter 
a- hey guys i was making comparison between the 8800gts 320mbs, and the 9800gtx+, the thing is that everyhting that 9800gtx+ have is faster than the 8800's but the memory bus is only 256bit , the 8800 is 320bit, so does it matter?

b- im asking this because im willing to sell my 8800gts and buy a 9800gtx+ or a gtx260, but im wondering if the gtx 260 deserve the extra 120$ from the 9800gtx+

c- how much performance gain will i gain if i update from 8800gts to 9800gtx+ and from 8800gts to gtx260
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post #2 of 10
I upgraded from 8800 gts 320 >> hd 4850 >> gtx 260 192 core. I would say that 4850 is about the same performance wise to 9800 gtx+ so can sorta make the comparison here. First upgrade from 8800 gts to 4850 at 1650x1080 resolution was huge. I was able to run pretty much all games at near max settings with it if aa was off. The upgrade form 4850 to gtx260 was also pretty noticeable. The second upgrade allowed me to up my aa settings and still maintain maxed settings at 1650x1080 on all games I play. I was playing fallout3, gtaIV, far cry 2, company of heroes, grid, and mirrors edge.
    
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post #3 of 10
A part of it depends on whether or not you plan on upgrading your power supply. A 9800 GTX+ may be okay on your PSU (but barely), but a GTX 260 will probably need more.

That's all I can add, but I wanted to get that in there.
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post #4 of 10
Memory bus width is not the only thing you need to look at when comparing performance.

The 9800GTX operates at 1100MHz DDR (2200MHz Effective), multiplied by a 256bit bus and dividing by 8 (1byte = 8bit) it'll give you 70400MB/s of bandwidth

The 8800GTS 320 operates at 800MHz DDR (1600MHz Effective), multiplied by a 320bit bus and again dividing by 8 it'll run down to 64000MB/s of bandwidth

You'll notice quite the improvement to the 9800GTX, being G92 core, higher memory bandwidth and faster core clock.

Answering both b and c questions, the GTX260 is an exccelent card, you can't go wrong with buying one and definitley topping the 9800GTX and slaughtering the 8800GTS


One thing though, that system might bottleneck your GPUs performance, you should consider overclocking your CPU if possible, and if going for the 260, a better PSU is highly advised.

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post #5 of 10
The 9800 GTX+ has stock clocks of 738/1836/1100 compared to the 8800 GTS of just 500/1200/800. The shaders are at 1836. The shaders are doing the actual rendering.
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post #6 of 10
wither card will be a good boost but look at the other costs. can your PSU power a GTX 260? frankly i think in your case a GTX 260 is overkill. you could grab this 9800GTX+ and step up later.

+ you can sell CoD: WaW to recoup some of the $$$

http://www.newegg.com/Product/Produc...82E16814130416

if you OC your CPU then you can start talking about getting the GTX 260
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post #7 of 10
9800GTX+ is almost twice the power of the 8800GTS 320mb in real world performance and GTX 260 would be there, and then some.

There's a big spec jump between the cards:
http://www.gpureview.com/show_cards....=571&card2=475
post #8 of 10
Thread Starter 
the thing is that i want to play crysis on enthusiast on 1024x1280, do you think that 9800gtx+ can handle it ?
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gamerz
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post #9 of 10
no.... but a 260 can im pretty sure, id bench mine but iot died:'( but my rma should be here next week
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post #10 of 10
All else being equal, a larger memory bus will yield better performance. The problem is, all else is almost never equal. Architecture; including GPU process, shader count, and frequency; memory type and frequency; (among other things), will obviously all effect performance to varying degrees. You'll have to test two (or more) actual cards to see which one(s) perform better. So, just because a card has a larger memory bus does not necessarily mean it will perform better than a card with a smaller bus. Other aspects may trump those benefits.
    
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