ATI Radeon HD 4000 Series discussion

[Calmatory]

Technically it is. Eric Demers posted this



So it sounds like cache can cause performance to scale greater than linearly

I stand corrected, but this only applies to Crossfire scaling.

So it goes like this: If clockspeed(or amount of cards, processors, memory etc.) increases by 100%, performance can't increase by more than 100% UNLESS the internal efficiency of the chip increases aswell (In this case the additional cache increased the internal efficiency of crossfire, thus the +100% increase in performance).

[Calmatory]

R700 having a much better interconnect between GPU's than with 2 separate cards allready gives the R700 a performance advantage over Crossfired 4870's with matching clocks.....therfore annihilat0r is correct that with a 5% clock increase on R700 could very well have a 15% performance gain over 2 4870's in crossfire.

in theary thats: Sideport comunication=10% gain over xfire
5% higher clockspeed=5% gain
=15%

Ah, so it was about R700 vs. 2x RV770XT? I thought he was talking about general 5% -> 15% improvement.

My bad

[G0ldBr1ck]

Thats how I took it, I think thats what he was saying

[alexio]

I stand corrected, but this only applies to Crossfire scaling.

So it goes like this: If clockspeed(or amount of cards, processors, memory etc.) increases by 100%, performance can't increase by more than 100% UNLESS the internal efficiency of the chip increases aswell (In this case the additional cache increased the internal efficiency of crossfire, thus the +100% increase in performance).

It does not only apply to multi-GPU solutions If you increase the performance/size/speed of some part of the GPU (or other complex micro processor for that matter) you can get more than linear scaling. In most cases this is only theoretically, but it can happen.

[flopper]

His comments can be NV-biased sometimes, but they are far from being worth derailing the whole thread. This is the precise reason that I had asked for this thread to be removed. The longer it goes, the less of a purpose it will have. Members wished for this thread to be kept on for R700 discussion and that is what this is for.
Perkam

I guess you told him that?
His behaviour has nothing to do in this thread due to that is what he want, derail and blame.

R700 unless someone contradict it will scale well, and most likely might not fix the microstuttering fully even if improved due to that being a sync issue with AFR and unless they have a linear dualcore working it will however improve the FPS a lot and then it also helps with the stuttering.

If ATI are serious with the multiGPU I guess they also spent resources to fix that issue, dosnt make sense otherwise.
If fixed or even nonexistent on R700, that card will sell like milk and honey.

Nvidia have serious problems this year.
Great comeback from ati.

x12515p in x mode in Vantage.
http://www.techpowerup.com/64351/Two...ntage.html:up:

edit:
Orgarticle;
http://www.tgdaily.com/content/view/38171/135/

[G0ldBr1ck]

Im realy glad to see AMD on top of the game for now, I have supported AMD for over a year now not because "I just like them better" but I hate to see them strugle as the only compatition to NV and intel. It would be a sad day for our Xstreme Hobbies if we lost a big player like AMD. Everyone would loose including the NV fanbois, so just be happy and know that this in time is only gonna make the prices of your precious NV cards go down. Its obvios that NV is going to have to follow siut in straying from Monolithic GPU's and Jump on the AMD bandwagon to lower production costs as well.

As far as that Vantage score of X12515 that is just amazing! The first Spider platform #1 you see in my sig clocked to 3.0ghz only scores x4840, yes I know it would be higher with a Intel CPU but that realy dont bother me.

EDIT: Just had another thought. If it happens to turn out that R700 does not use crossfire at all and is truely seen by system as one card, then 3 or 4 R700's could actualy be suported In crossfireX at least later down the road.........Just a thought but possable!!!

[Helmore]

That last option will probably not come to fruition as there is only a single 'golden finger' at the upper left corner of the card.

[G0ldBr1ck]

True QFT. perhaps in later designs....I can dream you know.

[YukonTrooper]

Any expected date for the 1GB versions?

[Helmore]

My guess is 3rd week of July or something like that, that's around the time that AIBs will start to roll out their own versions and not purely reference design based cards. That's just a guess based on the fact that factory OCed 4850 cards are supposed to appear around that time, but I think it's also a pretty safe bet.

[mascaras]

Palit Released HD 4870 & 4850 Cards








Palit Microsystems, leading graphics card manufacturer, today excitingly announces the much anticipated Radeon™ HD 4800 series products, Palit Radeon™ HD 4870 and HD 4850, which deliver a cinematic gaming experience with unprecedented performance while intuitively conserving energy at idle.

Palit Radeon™ 4870 is equipped with 512MB/256 bit of GDDR5 memory operating at a blazingly fast 3600MHz and a stunning 750MHz core speed. Palit Radeon™ 4850, with 512MB/256bit of GDDR3 memory operates at 1986MHz and 625MHz core speed. Palit Radeon™ 4800 series products with enhanced anti-aliasing (AA) and anisotropic filtering create striking graphics with unparalleled realism, allowing users to max out the settings of the most demanding games. The latest ATI PowerPlay™ technology is a platform-independent, intelligent power management technology which helps to deliver the power needed to blaze through even the most intense games and to conserve the energy when the demand is low.

Redefine HD gaming and go beyond HD video with Palit Radeon™ HD 4800 series products now. Support for DirectX® 10.1 graphics and scaleable ATI CrossFireX™ technology along with further sophisticated new features within ATI Avivo™ HD technology, Palit Radeon™ HD 4800 series products not only allow gamers to play today and prepare for tomorrow, but also provide a truly responsive experience ensuring users can take advantage of the latest display technology.


http://www.vr-zone.com/articles/Pali...ards/5914.html

regards

[HamTard]

How does an HD4850 at 700/1125 compare to an HD4870 in game performance? I'm really conflicted about which card I should buy.

[T3rm1]

I just ran the FurMark benchmark on my new 4850. Check result here. How is this possible? I get only 1590 points while other people with same card get over 5000!

[sparks]

got a couple of questions on the new 4800 cards.

All I hear is micro stutter on crossfire (I assume also sli Nvidia cards as well) happen on some systems, cards, or is this universal?

This game either does not support dual cards or the drivers do not support this game--NO SCALING so 2 cards are useless?

How true are these statements?

Do the X2 cards suffer from the same things as a pair of cards?

[largon]

T3rm1,
You're running the bench with 4x MSAA...

[T3rm1]

Oh, ok. But without 4 MSAA it's not much better
Is it possible that my card is broken?

[largon]

Stock HD4850 scores around 4000 at those settings so you're not too off. Certainly not 5000 anyways.

[sjg0]

Hey I'm going to buy a 4870, but before I do, I would like to know when and if any manufacturers will be releasing OC'ed cards or cards bundled with say.... Crysis?
If nobody knows exactly, what time frame do the manufacturers usually ship bundled and OC'ed cards?
Thx for any help.

[flopper]

got a couple of questions on the new 4800 cards.

All I hear is micro stutter on crossfire (I assume also sli Nvidia cards as well) happen on some systems, cards, or is this universal?

This game either does not support dual cards or the drivers do not support this game--NO SCALING so 2 cards are useless?

How true are these statements?

Do the X2 cards suffer from the same things as a pair of cards?

as I understand this,
if u go to low on FPS, say 30fps, then you might notice it, if you got enough fps, 60fps+ then stuttering is unlikly to happen.

so unless you get bottlenecked or running to high resolution, it is fine.

[Mechromancer]

If others are pushing 5000 then maybe you need to double check their CPU speeds. They may have 3.6Ghz Q6600s or crazy clocked E8400s. My Q6600 friends all run at 3.6Ghz.

[darkskypoet]

@T3rm1: I would say CPU limited a bit? You hit 4114 o3marks... but at that rez I found cpu can limit a bit... If your OC was higher you'd probably make up the difference. A lot of the benchmarks were probably done on a penryn core at around 4ghz... or even your core at around 3.6ghz and up.

Not that it is horribly applicable but when i was running 3dmark 06 I was getting seemingly really low scores at standard settings... but then Bump it up to 1680 x 1050 at 4xmsaa and wow.. very little loss in performance... ( I have just an x2-4000 @ 3ghz so cpu is limiting) I bet if you run yours up at 1680 x 1050 or something and ask for others results to compare. Also are you using the latest hot fix drivers?

[Moty]

Does anyone know how much ram chips do asus hd 4850 1gb have? 16? I worrying about radiators for them all...

[ihatbs]

I need to know something about Crossfire.

I've heard that linking hd4870 & hd4850 together will reduce the performance of hd4870 to the hd4850 performance.

Is that true ?

[Unbornchild]

Of course that's true. Would you expect the other way around?

[largon]

Moty,
Most likely it has eight infamous Qimonda 1Gbit chips.