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[VR Zone] GTX 280 GPU-Z - Page 5

post #41 of 100
i think i will wait for the 55nm revision.. then get 2 of them + nehalem.. if intelmanages to get SLi
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post #42 of 100
Quote:
Originally Posted by QuickS View Post
Yea but you are also forgetting that the HD4870 is limited to only 512MB of effective VRAM due to the 256bit bus. The GT280 can handle up to 1GB of effective VRAM since it has a 512bit bus.
How does the bus width effect capacity? There are 1GB 3850's and 8800GT's, both of which have 256-bit memory buses. There is nothing stopping the HD4870 from having 1GB. ATi did say they wouldn't support it officially, but would allow vendors to pair it with 1GB of VRAM.
post #43 of 100
The card will be so expensive,like when the 8800 Ultra came out.
 
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post #44 of 100
Quote:
Originally Posted by Nowyn View Post
Like u know now much it costs. GDDR5, i believe, costs quite a bit more comparing to GDDR3.
GDDR5 is about as much as a 512bit interface is. What drives the price of these cards is the yields. ATI is gettin 71% yields, NVidia is getting 40%. RV770 is almost 1/5th the die size of GT200. This means they get 5 times as many chips off a single wafer, and since every wafer is the same price, NVidia is losing money fast, and will continue to lose it until GT200b comes out.
post #45 of 100
Quote:
Originally Posted by darkcloud89 View Post
How does the bus width effect capacity? There are 1GB 3850's and 8800GT's, both of which have 256-bit memory buses. There is nothing stopping the HD4870 from having 1GB. ATi did say they wouldn't support it officially, but would allow vendors to pair it with 1GB of VRAM.
because graphics cards companies do that to sell them. 256-bit bus will only really use about 512mb of vram, no matter how much you put on there. 512-bit really takes advantage of the extra 512mb.
why do you think the 8800gtx STILL kills in crysis (768mb vram, 384-bit bus)

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post #46 of 100
Quote:
Originally Posted by BizzareRide View Post
Should be a killer with 25% more ROPs and about 45% more shaders, 50% larger ring bus and a bln transistors
That's 100%, or 50% (in the case of the G80) more ROPs.

The G92s have 16, a full fledged G80 has 24.

Quote:
Originally Posted by TnB= Gir View Post
Only ~17Gb/s better than the 4870 if I remember right. And also costs a hell of a lot more thanks to the 512bit bus.
To be fair, a lot of the extra cost of the 280 is going to be due to it's massive die-size (and implied low yeilds).

Quote:
Originally Posted by QuickS View Post
Yea but you are also forgetting that the HD4870 is limited to only 512MB of effective VRAM due to the 256bit bus. The GT280 can handle up to 1GB of effective VRAM since it has a 512bit bus.
Bus width has exactly zero bearing on the addressing limitation of the memory controler.

The only thing bus width effects is GPU/PCB complexity, the minimum number of memory ICs required, and bandwidth (the difference of which is minimal between these two cards).

Quote:
Originally Posted by smoke12291 View Post
because graphics cards companies do that to sell them. 256-bit bus will only really use about 512mb of vram, no matter how much you put on there. 512-bit really takes advantage of the extra 512mb.
why do you think the 8800gtx STILL kills in crysis (768mb vram, 384-bit bus)

If I could, I would de-rep you for taking a stupidly absurd myth to the next level of stupid absurdity.

The GTX still "kills" in Crysis because it has significantly more memory bandwidth of the G92s and, most importantly, 50% more ROPs.
Edited by Blameless - 6/3/08 at 9:28pm
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post #47 of 100
Blameless, read what i said.

i was saying the gtx is still great in games like crysis. i was using it as an example of a card that uses a higher amount of vram and a higher memory bus.

and BY THE WAY, the bus has ALOT to do with the memory limitation.
yes you right on the face that the memory controller can limit the TOTAL amount of memory put on the card. but the xxx-bit bus on every card WILL LIMIT the total amount USED.
hence why cards like the 8800gt 1gb can have 1gb but have no performance increase, and other cards alike.

and if you are interested,
the new gtx 280 has a 512-bit bus and 1024MB vram.
while the 260 has a 448 and 896mb of vram.

please understand what i am saying before going off on me. if i am wrong i will admit it, but i know for a fact the memory-bus plays a role in how much in used
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post #48 of 100
Quote:
Originally Posted by smoke12291 View Post
because graphics cards companies do that to sell them. 256-bit bus will only really use about 512mb of vram, no matter how much you put on there. 512-bit really takes advantage of the extra 512mb.
why do you think the 8800gtx STILL kills in crysis (768mb vram, 384-bit bus)

What you're referring to is actually a case where the memory bandwidth is the bottleneck for the card. Like if you had a 9600GT with 1GB VRAM, you could say that the card can't use 1GB, but that's not true. What you really mean is that the GPU itself becomes a limiting factor before the VRAM/bandwidth is. There is nothing limiting at all about the 256-bit bus on the RV770 because the raw speed the memory runs at makes up for it. If memory bandwidth is going to be a problem for the 4870, it will be an even bigger one for the GTX280.
post #49 of 100
You're posts are quite long for such a simple issue, so rather than reading through and trying to figure out if you're right or wrong, I will just state what is correct:

Both the width of the bus AND the clock rate determine how effectively the memory can be used. If you take a 256-bit bus, but somehow double its clock rate, then from a performance stand-point it's just like having a 512-bit bus!

Case in point: the upcoming ATI cards. They use a 256-bit bus (if I remember correctly) because they use GDDR5, which is much faster, so they don't need a wider bus.
    
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post #50 of 100
Quote:
Originally Posted by darkcloud89 View Post
What you're referring to is actually a case where the memory bandwidth is the bottleneck for the card. Like if you had a 9600GT with 1GB VRAM, you could say that the card can't use 1GB, but that's not true. What you really mean is that the GPU itself becomes a limiting factor before the VRAM/bandwidth is. There is nothing limiting at all about the 256-bit bus on the RV770 because the raw speed the memory runs at makes up for it. If memory bandwidth is going to be a problem for the 4870, it will be an even bigger one for the GTX280.
wait,
you're saying that the actual gpu (core?) is limiting BEFORE the memory bus?

could you explain maybe?
if im wrong i want to know.
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