ATI 4800 series rumors

[fuelrod]

More ATI 4800 leaks ..... coming sooner rather than later.

http://www.electronista.com/articles/08/04/21/ati.radeon.hd.4800.leak/

Update launch details

Another interesting article .....

http://www.tgdaily.com/html_tmp/content-view-37453-135.html

[Redeemed]

Correct me if I'm wrong... but TMUs are for ATi what ROPs are for nVidia... correct? If so, wont this *greatly* help the AA performance?

If this information does indeed prove accurate, then we might see GT200 or whatever the next new architecture is from nVidia a bit sooner as well. :D

[MUYA]

Correct me if I'm wrong... but TMUs are for ATi what ROPs are for nVidia... correct? If so, wont this *greatly* help the AA performance?

If this information does indeed prove accurate, then we might see GT200 or whatever the next new architecture is from nVidia a bit sooner as well. :D
Nope, for ATi and NVIDIA = ROP=ROP

The article may have misinterpreted that the 32 units. The R600 had only 16 ROPs and that was thought to contribute to the R600 AA performance ability. AA is traditionally handled by the ROPs but, can also be done through shaders. But here it seems that the boost in count of ROPs is going to benefit the R700!!! The G80 has I think 24? G92 have 16....not sure

[MUYA]

Or maybe I have my facts wrong but I am sure more knowledgeable folks will contribute

[Toss3]

Or maybe I have my facts wrong but I am sure more knowledgeable folks will contribute
8800gtx = 24ROPS, 8800gts 640 = 20 rops, 8800gts/9800Gtx = 16rops.

The 4800 is rumored to have only 16rops, just like it's predecessor.

[MUYA]

Plenty of powah in the shaders at 800+ Mhz and so now it's double the TMUs then? Hmm....at least that will make it more competitive in texture bound situations

Seems a very interesting product.

[SH64]

I hope it comes so soon to force nvidia to release their TRUE next-gen GPU. not some G92 hybrid bull****.

[Revs]

I hope it comes so soon to force nvidia to release their TRUE next-gen GPU. not some G92 hybrid bull****.

+1

We need something to give em a good shove. The high-end graphics card market is boring as hell ATM.

[nekrosoft13]

at least when it is boring there is enough time to save up those pennies ;)

[BronzeGod]

GDDR5, I hate them.......

[SeriTonin]

at least when it is boring there is enough time to save up those pennies ;)

So true.

[loafer87gt]

Are there any estimates as to how the new 4870 RV77XT will stack up against the 8800GTX? I badly want to upgrade my video card, but from what I have read Nvidia will not be releasing a true next gen part till the end of the year. I was hoping that they would have something on the market this summer, but it looks like all they have planned is more G92 parts. :(

[zer0]

heat and size.

i want it out of the equation.

[fivefeet8]

Correct me if I'm wrong... but TMUs are for ATi what ROPs are for nVidia... correct? If so, wont this *greatly* help the AA performance?


The increased TMU count will increase the cards performance in texture bound scenarios. To stay in line with their Texturing to Shader ratio ideology, they needed to increase the texturing performance of the 4800 to stay in line with their increase to Shaders anyways.

It remains to be seen if the new cards will include dedicated ROP based AA resolve as well as generalized Shader based AA resolve. I don't think it'll include it based on what some from ATi has said since the R6xx was released.

What will be interesting are what tweaks they've made to the shading scheduler/compilers.

[Dazz]

8800gtx = 24ROPS, 8800gts 640 = 20 rops, 8800gts/9800Gtx = 16rops.

The 4800 is rumored to have only 16rops, just like it's predecessor.
Yeah but considering the 8800GT/GTS 512 can keep pace with a 8800GTX shows that ROP's an't everything. TMU make quite a diffrence however more so inolder games that make little use of shaders.

[walterman]

Yeah but considering the 8800GT/GTS 512 can keep pace with a 8800GTX shows that ROP's an't everything. TMU make quite a diffrence however more so inolder games that make little use of shaders.

I do not agree at 100%, i'm actually seriously bounded by the memory bandwidth of my gfx card, cause i use FSAA/AF, and i do not like the idea of new gfx cards with less bandwidth.

[Toss3]

Yeah but considering the 8800GT/GTS 512 can keep pace with a 8800GTX shows that ROP's an't everything. TMU make quite a diffrence however more so inolder games that make little use of shaders.
Yes but it could be a limiting factor, but not in the same way it is for the g92.

[Dazz]

As for bandwidth it's not everything, it's efficiency. Although 3GHz GDDR5 256bit provides less bandwidth then say 2GHz GDDR3 512bit. It's about how big the textures are you will find that 256bit is better as the textures don't seem big enough to saturate the bus as such speed plays more of a roll. After all look at the X2900 Vs the X3870 dispite the X2900 having nearly twice the bandwith.

[mojoman0]

As for bandwidth it's not everything, it's efficiency. Although 3GHz GDDR5 256bit provides less bandwidth then say 2GHz GDDR3 512bit. It's about how big the textures are you will find that 256bit is better as the textures don't seem big enough to saturate the bus as such speed plays more of a roll. After all look at the X2900 Vs the X3870 dispite the X2900 having nearly twice the bandwith.

how do you guys know how all this works?

[Vik1dk]

Basicly its speed x bit/8= bandwidth

[walterman]

High resolution textures with 'only' AF, also need more bandwidth, cause you need to read more texels from the textures, to filter them. The problem with the R600 is the number of texture filtering units, which is too low to take advantage of all the bandwidth of the memory subsystem. But this isn't the case of the G80 or G92, where you have a proper number of TF units. Also the R600 has other design flaws that brake the performance of the architecture. It isn't a good example. And, if you add FSAA, the bandwidth plays even a more important role.

Actually i'm seriously bounded by the bandwidth of my G80, and my new BR2 HD project is going to need more bandwidth to keep running the game at an high frame rate (due to the sizes of the textures, as i said). I hope that the next gen nvidia gpu has around 2x times more bandwidth than the G80, cause it's what i'm going to need to run the game at 1920x1200 with the new textures and the full quality AA/AF. I dunno if the ATI cards can do SSAA, but if they can, i would consider getting a couple of cards for my X48.

[Odral]

Interesting quote from Toms article.

"Our sources indicate that the launch is only weeks away, so expect your usual hardware sites to feature dozens of reviews of 4850 and 4870 with GDDR5 memory, since this memory type will be a hot topic in months to come"

[Redeemed]

So they're more than likely going with GDDR5 this time? Hmm... still seems like they're trying the brute-strength approach over efficiency to compensate for the short commings of their architecture. But if it works, and allows for a highly competitive product, you'll not hear me complain. :D

[evox]

So they're more than likely going with GDDR5 this time? Hmm... still seems like they're trying the brute-strength approach over efficiency to compensate for the short commings of their architecture. But if it works, and allows for a highly competitive product, you'll not hear me complain. :D
+1

I'm skeptical though. All previous ATI products that were god-on-paper turned out to be average performers. :(

I really hope 48xx series kicks some ass. :D

[KasuCode]

I hope this is true:

http://www.fudzilla.com/index.php?option=com_content&task=view&id=7240&Itemid=1

The fastest of ATI's two upcoming chips, the RV770XT, will offer support for two cool memory marchitectures. One is GDDR5, a very fast memory, and the second is 512-bit memory interface.

We are getting back to the memory controller of R600, but possibly significantly improved, and this time the chip can cope with GDDR5 while the previous controller could only cope with GDDR3 and GDDR4.

As GDDR4 didn’t really get these cards any faster, ATI decided to go for GDDR5. We believe this is the future and this definitely makes the RV770 a bit bigger than the RV670 and this will be the most significant difference between the chips.

The launch date still remains June, with volume availability in July and onward.



GDDR5 with a 512bit bus. You would think if that were the case they would toss the ROPs Shaders and TMUs up quite a bit more. At least this card sounds good on paper.

lets see what happens.