ATI Radeon HD 4000 Series discussion

[zerazax]

Well, looks like we asked for pics of the 48xx's and we shall receieve (need translator!):

http://www.tomshardware.tw/549,news-549.html

Some tidbits:
-Second generation 55nm process
-TeraScale engine (?)
-GPU can do physics, ray tracing, AI, stream computing
-2 x 6-pin PCIE connectors for the 4870SKU

Too bad no other specs but the cards themselves look good!

[Macadamia]

The 4870 looks really like a sports car ;p

[mao5]

Tomshardware got the real pictures of 4870 and 4850

http://www.pczilla.net/en/post/23.html

[mao5]

AMD castrated the speed of RV770Pro2008-5-26 18:36:25AIB graphics cards marker told us that AMD had castrated the core speed of RV770Pro.

We’ve reported that the core speed of RV770Pro graphics chip can be reached at 990MHz (http://www.pczilla.net/en/post/4.html). But now AMD set the speed of retail version of RV770pro at 625MHz. AIB graphics cards marker told us this is the marketing strategy, in order to get the performance difference between RV770Pro、RV770XT and HD3870.

According to the AMD's reference design manual seen by AIB graphics cards markers, RV770Pro design frequency went beyond 900 MHz, that is when RV770Pro run in the 900 MHz frequency is only when the frequency of its design, and the 625 MHz frequency is obviously down to use.

Considering the Power play function and energy-saving features integrated in RV770Pro, so in some cases the core speed of Radeon HD 4850 will be even lower than the frequency of 400 MHz.

Radeon HD 4850 graphics card will equipped with 512 MB GDDR3 memory with 1ns speed, if its core speed runs at 900MHz frequency, its effectiveness will obviously go beyond the current Radeon HD3870, for this, AMD limited the first batch of public version of the Radeon HD4850, AMD will not allow AIB to ship Radeon HD4850 with overclocking out of box. This decision clearly shows HD4850 to be cost-effective products in this summer.

http://www.pczilla.net/en/post/24.html

[zerazax]

Looks like the 4850 is the price/performance card to get lol. So AIB's cant overclock the card... but we can do it for sure! 900mhz + 480sp for $240 might be gold!

[STaRGaZeR]

Except how do you know that it is a bridge chip?
Also they are using a slightly tweaked version of the R680 cooler.
Plus the fact that AMD/ATi themselves said that R700 wasn't simply two RV770's on the same PCB like R680...

That's why I said quick conclusion. That layout screams Crossfire in a card just like R680 unfortunately.

[AliG]

Thing is the 4850 might actually be starving for bandwidth unlike the r600, as we're talking nearly 500 shaders here, so you'd either need some uber fast gddr3, or gddr4/5 (hopefully AIBs will release gddr5 versions sameway there are gddr3 3870s)

[Nuker_]

Yeah, this time the card might starve for bandwidth. I think AMD has to find a golden red line between the performance of the GPU and its bandwith.
So the 4850 should handle at least 50% Oc on the GPU, nice! This will give it a very nice perfomance edge over 3870.

[AliG]

That's easier said than done, as you don't want too little bandwidth, but you're wasting resources with too much, not as easy as you think to do so. Better offer more than necessary than not enough imo

[Hell Hound]

So Sexy!!!!

[Papu]

1ghz core?

[zerazax]

I think ATI is intentionally starving the 4850 this time so it is indeed the Pro equivalent to the XT (like X1950PRO vs. X1950XT). The 3850's were basically lower binned 3870 it seemed but this time around, 4850's are underclocked and starved intentionally to create a larger difference (to justify the $100 price difference at least). Nevertheless, overclocking can win the day again

[biohead]

1ghz core?

It says 850 MHz does it not?

[Papu]

It says 850 MHz does it not?

we’ve reported that the core speed of RV770Pro graphics chip can be reached at 990MHz (http://www.pczilla.net/en/post/4.html).

who leaves things stock here?

[biohead]

who leaves things stock here?

Wasn't sure what he was referring to, though.

1ghz at stock volts would be awesome.

[zerazax]

And thats the RV770PRO GPU... if the RV770XT is the higher binned one, a true 1GHz+ stock air could just occur

[mascaras]

First ATI Radeon HD 4870 and HD 4850 Pictures Emerge

The Taiwanese website version of Tom's Hardware is hosting a brand new first look at ATI's Radeon HD 4800 series cards. Unfortunately, if you want to read something more than the posted pictures and the "Redefine HD Gaming" marketing charts, you'll need someone or Google to translate from Taiwanese for you, as you might have already guessed. What's interesting are the pictures below, that show the upcoming cards in all their glory. They also confirm our previous story about the cooling solutions that will be used on both cards. The first card pictured is ATI Radeon HD 4870, the second one is Radeon HD 4850.



Tom's Hardware.tw

http://forums.techpowerup.com/showpo...44&postcount=1

[FischOderAal]

Yeah, this time the card might starve for bandwidth. I think AMD has to find a golden red line between the performance of the GPU and its bandwith.
So the 4850 should handle at least 50% Oc on the GPU, nice! This will give it a very nice perfomance edge over 3870.

especially when you think of 1 GHz coreclock! I'm eager to see how much influence an increase in RAM-clock will have. this way we can easily see if RV770 really needs the bandwith that much and if we should wait for HD-4870.

Up to now my plan is to buy a HD-4850.

[AliG]

already posted (first post this page)

[Philip_J_Fry]

is this true:

RV770XT to challenge 9800GTX

http://www.fudzilla.com/index.php?op...=7511&Itemid=1

??? man this sounds bad for RV770

[mao5]

Anyone notices that Radeon HD 4000 series support Physics and ray tracing?

[Eastcoasthandle]

is this true:

http://www.fudzilla.com/index.php?op...=7511&Itemid=1

??? man this sounds bad for RV770

They also stated that the RV770 would come with 512bit 3 times. I would take that with a grain of salt.

[003]

is this true:

http://www.fudzilla.com/index.php?op...=7511&Itemid=1

??? man this sounds bad for RV770

I have a feeling ATI is going to get once again, unfortunately.

[FischOderAal]

is this true:

http://www.fudzilla.com/index.php?op...=7511&Itemid=1

??? man this sounds bad for RV770

why's that bad? R700 (2 x RV770) is to challenge GTX 280... this has been discussed several times now.

of course G200 is faster, but it's way more complex and therefore has a bigger DIE. RV770 will be good price/performance-wise.

[DilTech]

Anyone notices that Radeon HD 4000 series support Physics and ray tracing?

Any gpu supporting GPGPU technically supports physics and ray-tracing. The R600 could technically do the same, as could the G80. It's just that with intel making such a big stink about Ray Tracing, you're going to end up hearing about gpus already being able to process R.T.