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ATI, graphics business unit of Advanced Micro Devices, admitted that its latest graphics processing unit – ATI Radeon HD 4770 also known as RV740– is not supplied in proper quantities and that causes shortages on the market. The company blamed insufficient manufacturing yield rate of 40nm process technology of Taiwan Semiconductor Manufacturing Company.

“With TSMC's current 40nm yields, AMD was able to deliver a significant quantity of high-quality 40nm GPUs to ensure a worldwide hard launch, with every region receiving a supply of ATI Radeon HD 4770 cards. Although initial demand was met, AMD couldn't foresee the tremendous enthusiasm from the marketplace for the ATI Radeon HD 4770, and is currently working closely with TSMC on supply,” said Antal Tungler, AMD's European technical PR manager, in an interview with Hexus web-site.

According to numerous media reports, yield rate of chips made using 40nm fabrication process is very low, which is why it is physically hard to deliver sufficient amount of chips. Moreover, as yield (the number of working chips on a single wafer) gets lower, it becomes less profitable to manufacture chips, as a result, at some point developers of chips may reduce orders to actual manufacturer and either find flaws in their design or demand contract maker to fix the issues of the process technology itself.

In order to fulfill the demand towards high-performance graphics cards that cost below $100, ATI lowers the price of its Radeon HD 4850 and quietly introduces Radeon HD 4730: both graphics boards are based on ATI RV740 chip made using 55nm process technology, but deliver performance comparable to the Radeon HD 4770.

“We are working with our AIB partners to deliver a compelling solution in the same price band that will ensure supply long term. Even today, many users are opting instead to purchase a higher performance ATI Radeon HD 4850 card, which is available at e-tailers worldwide starting around $100  or €99 including value added tax,” added Mr. Tungler.

ATI Radeon HD 4770, which is powered by ATI RV740 graphics processing unit, features 640 stream processors, 32 texture units, 16 render back ends and 128-bit GDDR3/GDDR4/GDDR5 memory controller. ATI recommends its partners among graphics cards makers to clock the chip at 750MHz and install 512MB of GDDR5 memory at 3200MHz.

Tags: ATI, AMD, Radeon, RV740, 40nm


Comments currently: 2
Discussion started: 06/19/09 03:34:05 PM
Latest comment: 06/22/09 11:42:30 AM


" ... Radeon HD 4850 and quietly introduces Radeon HD 4730: both graphics boards are based on ATI RV740 chip made using 55nm ..."

OMG, These are not RV740 products but RV770 based products and HD4730 is a pile of crap considering RV770 is not optimised for 128-bit bus and they also cutdown ROPs to more distinguis this power hungry crap from older bro HD4830 which is slower but full 256-b width bus with 16 and not only 8 enabled ROPs. Anyway it's poor way to milk even more money on failed RV770 dies. To hell with them when they squeeze even the last bit of already "platinum profitable" RV770 die for ATi

"...16 render back ends and 128-bit GDDR3/GDDR4/GDDR5 memory controller"

OMG, failure after failure. HD4730 has ONLY 8 ENABLED ROPs @750MHz (HD4770 clock) and it sucks
0 0 [Posted by: OmegaHuman  | Date: 06/19/09 03:34:05 PM]

@OmegaHuman: I've seen nothing but 16ROPs everywhere I look for RV770-4730. Link to your info?

OT: If chip-yields are that bad then why don't they harvest a few bad RV740s? Why not make a 4750 and a *real* 4730? I'll even make up some semi-educated numbers:

HD 4750
640SP 32TMU 16ROP @ 600MHz
128-bit memory 512MB+
GDDR3 @ 900MHz+ or GDDR5 @ 700MHz
60-75W no power connector?

HD 4730
480SP 32/24TMU 16/12ROP @ 500MHz
128-bit memory 512MB+
GDDR3 @ 6/800MHz
Sub-70W no power connector.

Just a guess. AMD may be trying to clear out old inventory before they release anything else, 4670s and such. Yes, my 4730 is hypotheticaly slower than the should-be 4810. I think it should be that way.

Remember: the 4700 series is supposed to sit between (and slighlty overlap) the 4600 and 4800 series. In terms of die size and power consumption/heat, RV740 should not be much greater than RV730 while nearly rivaling RV770 in performance.

Still, One can only imagine what the 5600/5800s will bring. How about 160SP 5370 w/ 64-bit GDDR5 & UVD3? Passively cooled? $40 a year from now?
0 0 [Posted by: cheeseman  | Date: 06/22/09 11:42:30 AM]


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