ATI Radeon HD 4770 Specs

r_manic

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Thought these might be useful:

-40nm technology
-Replaces 4830
-Will compete with 9800GT
-Core Clock speed: 750Mhz
-Memory clock speed: 800Mhz
-Memory bandwidth: 51.2GB/s
-Memory interface: 128-bit GDDR5
-Memory size: 512MB
-Requires 80W
-Release on May 4 at $99
 

Dekasav

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I would like to change this:

Pricewise, it very well could compete with the 9800GT.

But performance-wise, it looks to kill.
 

L1qu1d

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What I did like is they managed to save some money by making the card 128 bit and add GDDR5.

I dunno how it will perform against the 9800 GT performance wise, but I hope we see a version with out the 6 pin.
 

Dekasav

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I think it'd be cool to have a 4-pin molex version, but I don't know if that's against PCI-e standard. If it's max power draw is 80watts, certainly a 4-pin can supply that. I think that'd help a lot of people justify a 4770 over a 4670. Old PSU's don't have PCI-e 6-pin connectors.
 

L1qu1d

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well I dont see that happening, seeing as my Corsair 1000HX has 2 4 pins only which are both used combined on my motherboard.

Nor do I see them using 4 pin HDD and CD driver ones either. It would be cool to see Sata style cables used like that though:p haha.

Anywho 6 pin is fine, I mean my 400 watt managed to power my old 280 GTX before I sold it. I use to have a corsair 620HX in there but I sold that 2 with my 4870 X2. lol

So aot has changed haha:p

This card will lower prices again thats for sure. Plus I think it will be good for Grid :)

 

Dekasav

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I'm 90% certain they supply the same power.
 

RazberyBandit

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That is correct, kinda. PCI-Express slots, no matter the version, provide 75W of power through the actual slots. In addition to that, the original 6-pin PCI-E Graphics power cable added 75W. When PCI-E 2.0 was introduced, so was the 8-pin PCI-E Graphics power cable, which could deliver 150W of power in addition to the 75W from the slot and 75W from the 6-pin.

The slot itself is still limited to 75W, no matter the version. (Source)
 

RazberyBandit

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Sorry, but I fail to see how that could have saved them any money. Have you got some price lists for 128-bit memory buses vs 256-bit ones? How about GDDR3 vs GDDR5? I'm sure AMD/ATI has plenty of all four lying around to tinker with, but to say they made this configuration decision based on price seems a bit... presumptuous. :)

Maybe they did it to prove that they could use GDDR5 on mainstream cards and rub yet another card in nVIDIA's face that had it. Let's ask them why. :)

Could you imagine what kind of memory bandwidth we'd see on ATI cards if they had the same 448-bit memory bus nVIDIA uses? Yikes! Maybe we'll see that for PCI-E 3.0!
 

L1qu1d

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The card is starting out at 100$, you make ur opinon about that.

Its not like the company needs to prove anything, ATI always seems to bring p/p to the table, I doubt they would give a damn what any1 thinks about the hardware they use.

So yes I'm being presumptuous but I think I'm right:) Thats why its my opinion.

I would have to say that the die shrink isn't the only reason why they can lower the card that till now shows signs of being 1.3 on avg of a 9800 GT (Based on unofficial charts).

We'll see what happens.
 

boudy

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I predict the 4770 competing with the GTS 250/9800GTX+, and the 4750 competing with the 9800GT performance-wise, BUT price-wise, I predict the 4770 competing with the 9800GT and the 4750 competing with the 9600GT.

Well, I cant wait to see some reviews. Hopefully we will see some in the next couple of weeks.
 

JAYDEEJOHN

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If you have only 128 connects vs 256, but the 128 are moving twice as fast, theyre the same, except for costs. If 512 was as cheap as a 128 bus, then wed never have any gpus thatre BW starved. Wed all be using 512, and GDDR5 wouldnt be used, as thered be no advantages to it. Even tho it does cost more, maybe ATI just likes to spend money? No, its cheaper in the end
 

RazberyBandit

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I still don't think it had anything to do with price. I think it had everything to do with the memory bandwidth of the card specifically, making sure to give it more than the 4670, but less than the 4850, thus ensuring it couldn't outperform the 4850 in applications/games where memory bandwidth is a major performance factor.

 

spathotan

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I ensure you that GDDR5 is alot more expensive than GDDR3. I didnt even realize that was up for debate. Youre comparing 4 year old chips made by 1000 different companies compared to 1 year old chips that are made by what....2 companies? Samsung and Quimonda? Hynix?

As far as the "pricetag" on memory BUS goes, the larger the memory bus the bigger the PCB has to be in gereral as it takes up a very good amount of space. You can make your own conclusions from that.

This isnt exactly rocket science here believe it or not.
 

jennyh

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The DDR5 on these 4770's is probably over a year old stock, and not exactly the best of the bunch either. That's why it's clocked at 800mhz and i'm pretty sure ATI are buying it at rock bottom prices.
 

JAYDEEJOHN

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GDDR5 wont continue this high price. Its been out for over a year. Its soon going to be mainstream, so theres little reason for any large costs over GDDR3, soon anyways. Currently it is more expensive. And like Spat said, not having it requires many more things on your pcb, thus making the higher costs redudant, and most likely a cheaper solution than GDDR3 with all the connects, plus the bus itself.
 

RazberyBandit

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Many sites will, just like they did with the pre-release 4890s and GTX275s. We saw cards from the partners, then. But, didn't ATI already pass around a few of their "home-grown" or in-house reference boards?
 

jeffredo

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So does that mean they'll doing away with the HD 4850 too? Because the GTS 250 already competes with it and oftentimes wins.
 

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