ATI Radeon HD 4000 Series discussion

[Macadamia]

I hope that you are right Papu as it would really give Ati the edge. It has been a while since I had an ATi card so I am looking forward to returning to being back on the Red

However a lot of people do not realise that the 4850 is in fact the RV770PRO which has 480SP and 24TMU. I am guessing that the RV770 4870 form which has the full 800SP and 48TMU.
Where did I get that from?

The Box blurb which was acidentally posted on Amazon.com



Any ideas when the NDA is going to be lifted and when the HD4870 (1GB DDR5) will be released?

I am still tempted by the Zotac AMP 700Mhz GTX 280, however if the HD4870 comes close (within 10%) and for 66% of the price... I will certainly buy the RADEON over the Geforce.

John

The Amazon specs are wrong. Both chips are the same deal, just different clocks.

I really recommend that you wait till the 4870X2, even though it's more expensive I'm really sure it's a heck of a card.

[emoners]

not too long to wait - i really want a pair of 4870's to replace my Gts640

same boat here...think it's time to retire my 8800GTX

[perkam]

800SPs has already been confirmed due to TFlop numbers.

Now we wait for TMU confirmation.

Perkam

[AliG]

I'm betting its 40 TMUs, the diagram looked legit and keeps the same ratio the r600 did, unless if that diagram is fake and ati is planning on doing 8 arrays of 20 shaders to get 8*4=32, imo its 40

[ownage]

It seems R700 should be in available in 8 weeks, and there is no official name for it yet.

[y2kbos]

A guy on a another forum has been saying that the HD4870 is basically as fast as HD3870X2 in games that scale well in Crossfire and faster in games that dont scale that well like Crysis.

Results he gave on the two most demanding games.

QX6850 @ 3.0ghz
4gb ddr3 1066
Vista Ultimate 64

Crysis Very High 1920 x 1200

GTX 280 34.2 fps, HD4870 26.9 fps

Lost Planet 1920 x 1200 4 x AA

GTX 280 38.7fps, HD4870 29.86 fps

Scores are good imo, especially if Crossfire scales well..

[XSAlliN]

Finally some facts, R770 has only 160 SP which are capable of 5 operations per cycle (that's where they concluded the 800 SP). 40 TMU's should bring enough balance for this configuration.

[JohnZS]

A guy on a another forum has been saying that the HD4870 is basically as fast as HD3870X2 in games that scale well in Crossfire and faster in games that dont scale that well like Crysis.

Results he gave on the two most demanding games.

QX6850 @ 3.0ghz
4gb ddr3 1066
Vista Ultimate 64

Crysis Very High 1920 x 1200

GTX 280 34.2 fps, HD4870 26.9 fps

Lost Planet 1920 x 1200 4 x AA

GTX 280 38.7fps, HD4870 29.86 fps

Scores are good imo, especially if Crossfire scales well..

That is pretty much what I am begining to expect, RV770Pro = 480SP. RV770XT = 800SP

I am hoping that the HD4870 leans more towards 9800GX2 performance than 9800GTX as I am looking to upgrade from a 8800GTS

pop two of those in and then you will be faster than G280GTX (if software supports Crossfire).

If the HD480X2 is going to be any good it better have 2GB of RAM or a vast new improved multiGPU technology otherwise it is going to be the same old problems which can effect the GX2 and HD3870X2's due to 512MB of RAM percore?

John

[informal]

That is pretty much what I am begining to expect, RV770Pro = 480SP. RV770XT = 800SP

I am hoping that the HD4870 leans more towards 9800GX2 performance than 9800GTX as I am looking to upgrade from a 8800GTS

pop two of those in and then you will be faster than G280GTX (if software supports Crossfire).

If the HD480X2 is going to be any good it better have 2GB of RAM or a vast new improved multiGPU technology otherwise it is going to be the same old problems which can effect the GX2 and HD3870X2's due to 512MB of RAM percore?

John

You are very wrong.There is only one RV770 chip,and it has 800 Stream Processors or 160 shader processors with 5 stream pr. in them.
There is no 480 Sream proc. RV770 chip ,there never was.
To check this,you should look at Firestream 9250 thread in which AMD claims 1TF for basically Radeon 4850 with 1GB of frame buffer memory!One teraflop = 625Mhz x 2Flops x 800

[mascaras]

A detail look of PowerColor HD 4850 512MB GDDR3













http://en.expreview.com/2008/06/17/a...0-512mb-gddr3/

regards

[w0mbat]

http://www.forumdeluxx.de/forum/showthread.php?t=500923

[Hornet331]

hmm crossfire 4850 23fps in crysis very high 1920x1200 @ 4aa

[bedlamite]

Well with 3 GHz Phenom.
Thats quite... fast?

[w0mbat]

Way faster than GTX 280 and much cheaper

[Hornet331]

cpu really doesn't matter at that res, it may hinders the min fps, but it only marginaly influences the avarage fps.

im still searchign for a review with 1920x1200 @ 4AA but i only can find some with 2AA right now -> 280GTX 28fps 260GTX 23fps

[y2kbos]

Well with 3 GHz Phenom.
Thats quite... fast?

Similar to 9800gx2/ faster than 3870X2

[y2kbos]

Way faster than GTX 280 and much cheaper

About the same, but will feel much much smoother with GTX 280

[Hornet331]

ok for 280 gtx @4aa -> ~15-16fps

[Papu]

really you've tried then?

[informal]

About the same, but will feel much much smoother with GTX 280

You know this,how exactly?Did you try 4870X2 or 4850 CF yourself?

[w0mbat]

9850@3GHz
4850 CF@default

CoJ@1920x1200@max@4xAA/16xAF

[Hornet331]

About the same, but will feel much much smoother with GTX 280

indeed your right in the territory of micro stuttering.

i hope oced 4870 gives you a boost up in the low 40s (i expect to much )

[STaRGaZeR]

Finally some facts, R770 has only 160 SP which are capable of 5 operations per cycle (that's where they concluded the 800 SP). 40 TMU's should bring enough balance for this configuration.

The same balance of RV670. 320/16 = 800/40 in terms of proportion.

[y2kbos]

You know this,how exactly?Did you try 4870X2 or 4850 CF yourself?

No

Games are always smoother with a single card imo.

4870x2 might change that, but I doubt Ati has anything that complex ready.

Give me a 8800gtx over bit faster 2 x 9600gt anyday.

[w0mbat]

R700 isnt the same as R680.