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  #21 (permalink)  
Old January 10, 2009, 11:30 AM
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Originally Posted by Chilly View Post

No hard feelings, but I gotta correct you. The GTX 295 IS the 280GX2. The memory is using a smaller bit length with hobbles the card a bit(due to reduced memory bandwith) but otherwise the 2 GPU's used in the 295 are the same ones as in the 285.

Now I haven't read much into the rumours of the GTX 3xx series(I know nothing about them, other than they are due out soonish), but even in the worst case scenario where the 3xx series is just a re-badge like the 9xxx series were, that doesn't change the fact that the GTX 295 IS the GTX 280 GX2 which you speak of.
All I have to say is look at the specs of the GTX295 and then look at the specs of any GTX260 C216, and tell me you don't see a correlation. 1792MB is 2x896MB. The core clocks are the same. The Shader clocks are the same. The same memory interface (per GPU), Same amount of ROP's per GPU...aye.
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  #22 (permalink)  
Old January 10, 2009, 01:28 PM
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Is the GTX 295 worth getting if you have a GTX 280? I've noticed that XFX's GTX 295 has 602MHz Clock Speed and 1792MB 2.21GHz GDDR3 Memory compared to EVGA, BFG etc which has 576MHz Clock Speed and 1792MB 1.998GHz GDDR3 Memory. From looking at the review on here, the min frame rate of the GTX 295 is disappointing.
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  #23 (permalink)  
Old January 10, 2009, 02:17 PM
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I dun know much about the GTX295
but isnt it more similar to a "260GX2" instead of a "280GX2"...?
both Specification wise and Performance wise

If the above statement is correct
i don't see any reason to dethrone the 4870x2 just yet
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Old January 10, 2009, 04:36 PM
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Originally Posted by howdid View Post
I dun know much about the GTX295
but isnt it more similar to a "260GX2" instead of a "280GX2"...?
both Specification wise and Performance wise

If the above statement is correct
i don't see any reason to dethrone the 4870x2 just yet
The 295 GPU's are as powerful as the 280/285(they use the same ones as) BUT the memory layout and bandwidth is similar to that of the 260.

Basically the 295 is like taking two 260 boards, using 285 GPU's(55nm, fully unlocked shaders), place an internal SLi bridge on it, and sandwiching it into 1 pci-express connector. I make it sound more cynical than it is, but, that's the gist of it.

Last edited by Chilly; January 10, 2009 at 04:53 PM.
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Old January 11, 2009, 03:28 PM
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XD Wait, you're right on that, Chilly. GTX295 IS GTX280 GX2, surrounded by GTX 260 parts. My bad. Are they going to release a full-on GTX280 GX2 w/2GB and a 512-bit interface?

And...correct me if I'm wrong, but the GTX260 and GTX280 are the same GPU with different memory, etc. arround them. Same way that the 4850 and the 4870 are the same RV770 chip, but 4870 has GDDR5, etc.
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  #26 (permalink)  
Old January 11, 2009, 04:47 PM
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Quote:
Originally Posted by ImmaPC View Post
XD Wait, you're right on that, Chilly. GTX295 IS GTX280 GX2, surrounded by GTX 260 parts. My bad. Are they going to release a full-on GTX280 GX2 w/2GB and a 512-bit interface?

And...correct me if I'm wrong, but the GTX260 and GTX280 are the same GPU with different memory, etc. arround them. Same way that the 4850 and the 4870 are the same RV770 chip, but 4870 has GDDR5, etc.
eh...?
hold on a minute
im not trying to be an asshole here
but
if the GTX280 and GTX260 have the same GPU just different memory etc around them
and the GTX 295 is two GTX280 GPU's with GTX260 memory etc around them slapped into one card

then is the performance closer in comparison to two GTX260s instead of two GTX280s in SLI???
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  #27 (permalink)  
Old January 11, 2009, 08:41 PM
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Quote:
Originally Posted by howdid View Post
eh...?
hold on a minute
im not trying to be an asshole here
but
if the GTX280 and GTX260 have the same GPU just different memory etc around them
and the GTX 295 is two GTX280 GPU's with GTX260 memory etc around them slapped into one card

then is the performance closer in comparison to two GTX260s instead of two GTX280s in SLI???
The GTX 295 would be smack dab in the middle performance wise.

GTX 260 SLi < GTX 295 Solo < GTX 280 SLi

As for you ImmaPC, no, unfortunately not. nVidia would of gone all out on the GTX 295(and they tried, trust me) if they could. A 512bit bus would cause too many heat issues, as well as increase the complexity/price of the PCB. They had enough issues all around with the complexity, heat and mammoth size of the GTX 2xx GPU as it is, even with the 55nm shrink.

As for the second part, its a Yes and No situation. The GTX 260 uses defective GTX 280 GPU's. Before you jump on me, let me explain what I mean by "defective".

Normally when a wafer is made/built, not all of the GPU's on a batch will work 100%. There are usually random parts on each core that are prone to failure, such as the shaders. The "perfect" cores go on to be GTX 280's, while the less than perfect cores(a few broke shaders here and there, but otherwise working) have their "broken" shaders (laser)cut off, and producing a then "100%" working chip with a lower shader amount. This lower shader count(192) GPU would go on to become the GTX 260 GPU.

Eventually the yeild goes up to the point where with each and every batch less and less shaders per GPU become defective, nVidia took advantage of this fact by cutting off access to less shaders(216 vs 192), and sold them at a premium but still less than a perfect core. This is what spawned the GTX 260 "216".

So that is where the "Yes, but No" answer comes from, Yes they use the same GPU as the GTX 280, but No, its not exactly the same.

Last edited by Chilly; January 11, 2009 at 08:53 PM.
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