ATI Radeon HD 4000 Series discussion

[Macadamia]

I doubt that they will be THAT fast. Otherwise they wouldn't need duals to be fast.

Well, whichever is faster, I don't case as long as the TDP stays below 95W, and price below $150.

I'm really puzzled at what Fuad + Chiphell is saying.

He says the XT has a 512-bit bus while the PRO is 256-bit and GDDR3 (but the latter is more or less inconsequential, more impact on cost only)

Yes, yes, you could cut down busses at all, but the point is a 512-bit chip would NOT be small enough to be X2-ed. A 512-bit chip would ALSO likely need extra ram modules, considering I don't think GDDR5 has 64-bit modules on the cheap, or such 64-bit modules exist at all.

On the Chiphell side, nothing has been announced, except for the coolers. The RV770XT cooler seems to cater for a backplate on the other side of the PCB (all the cards who had that hairdryer cooler did), and cools a chip with a TDP of 150+W.

The RV770PRO cooler cools like the RV670PRO/3850 cooler, about the same TDP.


I don't think you can even increase TDP that much by ramping clocks! (On the ATI side, nVidia did it but it reeked of desperation) 55nm is mature, but yields for such a chip won't be good.


Coupled with the 480SP/800SP doubling rumor, there could actually be 2 chips, and none of them are clocked to hell-ish clocks.


Just my 2.5 cents.

[Calmatory]

GDDR5 alone brings in sufficient(or near sufficient) bandwidth if the clockspeeds are high enough. 512bit bus would alone bump the memory bandwidth by 100%. I don't know if it really helps the preformance, but at least it will cost more than 256bit bus, and so would GDDR5 cost more than GDDR3, so expect single RV770XT to be quite expensive to manufacture when compared to the PRO chip.

[Macadamia]

^

Yeah, and GDDR5 supplies aren't too good right now. CHH says 10:1 ratio of XT:PRO. D:

[madcho]

I doubt that they will be THAT fast. Otherwise they wouldn't need duals to be fast.

Well, whichever is faster, I don't case as long as the TDP stays below 95W, and price below $150.

4870 is going to be 30 to 50% faster over 3870 with same TDP and 200-250$ price range.

This is fast.

[bill_d]

^

Yeah, and GDDR5 supplies aren't too good right now. CHH says 10:1 ratio of XT:PRO. D:

says gddr5 supply is ok

http://www.xbitlabs.com/news/video/d..._Imminent.html

[Calmatory]

4870 is going to be 30 to 50% faster over 3870 with same TDP and 200-250$ price range.

This is fast.

Yeah, not a bad deal at all. But people seem to consider at least 50% speed bump "fast", otherwise it is a "flop"

[Nuker_]

Yeah, not a bad deal at all. But people seem to consider at least 50% speed bump "fast", otherwise it is a "flop"

I usually take a 80-100% speed bump for granted, but now when AMD is only going for the mainstream market I think that is too much too ask...
However, they release gfx cards more often to compensate, so it's not too bad.

[BrowncoatGR]

512bit +GDDR5 is insane and useless. I doubt thats real. It doesnt make any sense.

[tenebre]

512bit +GDDR5 is insane and useless. I doubt thats real. It doesnt make any sense.

If you think of 4870 as 2 RV770 cores on one die that share 1GB mem on 512bit bus then it makes sense.

[AliG]

Only reason I can see ati going with 512 bit for the rv770 is because gddr5 supply is too low and they are planning on also releasing a gddr3 version of the 4870

[whocaresbg]

Confirmation about these question wasn't appeared . Some guys in other forums thinking that RV770XT should be a MCM solution with fast interconnect and shared memory and therefore wider bus in combination with faster memory should be benefit .

[AliG]

not going to happen, the old plan was for the r7xx to have up to 4 of the same gpus on a single pcb (the more $$, the more gpus you got), but I guess ati figured out that a single strong gpu is better due to the not 100% scaling of sli and xfire, so that was scrapped


Once again, only chance the rv770 has of getting the r600's ringbus is if the gddr5 supplies are too low and they need to launch a gddr3/4 product to steal gt200's thunder/market share before gt200 launches

[drjunk]

I found this:

http://xpentor.com/mamboserver/index...=1016&Itemid=1

[Jakko]

I found this:

http://xpentor.com/mamboserver/index...=1016&Itemid=1

Old and (most likely) fake.
Good find tho

[clayton]

Lol. I just want these to handle Crysis with ease, the game that is being used as benchmarks for next-generation handwares. So far, we have yet to see a single card doing MAXED settings at a ridiculously FPS.

[whocaresbg]

I saw in HardOCP another speculative comparison chart, type "RV770 vs 9800GX2" and it was showing slight performance margin for RV770 .

[STaRGaZeR]

If the MSRP is $250 better they can outperform at least the 9800GTX.

BTW, May 13th and still no real info or benchs. I smell something bad here.

[Calmatory]

I found this:

http://xpentor.com/mamboserver/index...=1016&Itemid=1

Fake. With those scores CPU score has to be 5071. No CPU reaches that with 3GHz clocks. Needs some 3.3-3.4 GHz for an QX9650 to reach 5k.

9800GX2 score needs CPU score of 4397 to be valid. That is probably the CPU score they got with the run, so I am quite sure the GX2 score is valid, but the RV770 score is fake, obviously. But what if they have ran the test with RV770!? With same CPUs core? Then the SM2 should've been 8280 +/-1 and SM3 should've been 12250 +/-1.

Thus I claim that those benches are purely fake, as stated many times before.

[AliG]

ugh I'm sick of seeing those same fake results for like the 5th time, don't you guys actually read the threads?

[adamsleath]

GT200 is something that Nvidia is preparing to show under NDA to many journalists in late May at its headquarters and we wouldn’t be surprised if we see it at Computex 08 as it should be ready to launch around that time.

this sounds believable.

2-4 weeks time some actual real numbers?
smoke me a kipper if anything more leaks b4 then

[Jakko]

If the MSRP is $250 better they can outperform at least the 9800GTX.

BTW, May 13th and still no real info or benchs. I smell something bad here.

Why so negative?
Surely it's also possible that Ati wants to keep info and performance estimations a secret for as long as possible, with nvidia still tweaking their next release.

[STaRGaZeR]

Why so negative?
Surely it's also possible that Ati wants to keep info and performance estimations a secret for as long as possible, with nvidia still tweaking their next release.

I prefer being negative. Then, if RV770 is a kick ass product, I'm going to be happier. I don't know what to expect after R600, you know. If launch is in early June, there should be samples and preliminary benchmarks floating around.

[adamsleath]

Then, if RV770 is a kick ass product, I'm going to be happier.

plan for the worst hope for the best...

[STaRGaZeR]

Exactly Mr. Mugatu

I love that movie

[mascaras]

4870 is going to be 30 to 50% faster over 3870 with same TDP and 200-250$ price range.

last rumors i saw >> about 329$-349$

the 1GB GDDR5 powered 4870 will retail between $329-349.


http://www.tgdaily.com/content/view/37093/135/

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