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1 2 3 4 5 6 7 8 NextATI Radeon HD 4770: ATI's First 40nm GPU
Apr. 28, 2009 by Lawrence Lee
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Product
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ATI Radeon HD 4770 512MB
PCI-E Graphics Card
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Manufacturer
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MSRP
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~US$99
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As the underdog in the chip wars, AMD has traditionally targeted
users with products that offer good relative value, rather than maximum performance.
A prime current example is their fastest desktop processor, the Phenom II. Their current
flagship CPU, the Phenom II 955 Black
Edition falls a bit short of Intel's fastest and and more costly Core 2 or
Core i7 chips, but it was well received by the most of the tech web press
due to AMD's aggressive pricing. Their graphics division, ATI, has been following
a similar path, offering great value cards like the energy efficient Radeon
HD 4670 and HD 4830 for gamers with tighter pockets. In these troubled financial times, it's could well turn out to be a very effective strategy.
Currently, consumers looking for a budget gaming card for about $100 have ATI's
Radeon HD 4830 and nVidia's
GeForce 9800 GT to
choose between. They are neck-in-neck in terms of performance, but as of date,
9800 GT's are retailing for about $10 more. To hammer this position further,
ATI has released its first GPU built with a 40 nanometer manufacturing process,
the Radeon HD 4770. ATI says it is a better performing, more energy efficient
replacement for the HD 4830.
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The Radeon HD 4770.
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ATI rated the HD 4830 as a 110W card and employed a single-slot cooler. Strangely,
the new HD 4770, despite having a 80W thermal envelope, has a dual-slot reference
heatsink. Both cards require a 6-pin PCI-E power cable.
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Tale Of The Tape: HD 4770 vs. HD 4830
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| Model |
HD 4770 |
HD 4830 |
| GPU Core |
RV740 |
RV770LE |
| Manufacturing Process |
40nm |
55nm |
| Transistor Count |
826 million |
956 million |
| Stream Processors |
640 |
640 |
| Core Clock |
750 MHz |
575 MHz |
| Memory Clock |
800 MHz |
900 MHz |
| Memory |
512MB GDDR5 |
512MB GDDR3 |
| Memory Bandwidth |
128-bit
51.2 GB/s |
256-bit
57.6 GB/s |
| Average board power |
80W |
110W |
Compared to the HD 4830, the 4770 has an equal number of shaders units, a higher
clock speed, but smaller transistor count, slower memory and less memory bandwidth. The die-shrink from
55nm to 40nm is no doubt the reason for lower power requirement. With the smaller die, it's surely cheaper to build.
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Technical specifications according to GPU-Z.
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