The day before yesterday we revealed the specifications of the HD 5870. Those also contained 1600 stream processors, 80 TMUs and 32 ROPs, and with that, definitely twice of the HD 4850/4870/4890. This also leaves a mark on the transistor budget of the chips, which is now twice as high with 2.15 Billion circuits. Despite the 40 nm technique the chip size amounts 338 mm², so the chip is the second-biggest AMD chip after the R600.
| . | HD 4870 | HD 4890 | HD 5850 | HD 5870 |
|---|---|---|---|---|
| Technique | 55 nanometres | 55 nanometres | 40 nanometres | 40 nanometres |
| Transistors | 0,96 Billion | 0,96 Billion | 2,15 Billion | 2,15 Billion |
| Chip size | 260 mm² | 282 mm² | 338 mm² | 338 mm² |
| Chip frequency | 750 MHz | 850 MHz | 725 MHz | 850 MHz |
| Memory frequency | 900 MHz | 975 MHz | 1000 MHz | 1200 MHz |
| Stream processors | 800 | 800 | 1440 | 1600 |
| Shader performance | 1200 Gigaflops | 1360 Gigaflops | 2088 Gigaflops | 2720 Gigaflops |
| TMUs | 40 | 40 | 72 | 80 |
| Texel fill rate | 30.000 MT/s | 34.000 MT/s | 52.200 MT/s | 68.000 MT/s |
| ROPs | 16 | 16 | 32 | 32 |
| Pixel fill rate | 12.000 MP/s | 13.600 MP/s | 23.200 MP/s | 27.200 MP/s |
| Memory interface | 256 Bit GDDR5 | 256 Bit GDDR5 | 256 Bit GDDR5 | 256 Bit GDDR5 |
| Memory bandwidth | 115,2 GB/s | 124,8 GB/s | 128,0 GB/s | 153,6 GB/s |
| Prices | - | - | $299 | $399 (1024M) $449 (2048M) |
As we could learn now, the HD 5870 will appear in several versions, one with 1024 and another with 2048 MiB texture memory, although it is still uncertain through the loss of official benchmarks if the bigger memory adds up at all. The doubled memory will result in 50 USD more in price. This means for the HD 5870 with 1024 MiB texture memory still to be at 399 USD, while you just find a < 400 USD on AMD's newest documents, so 449 USD for the 2048 MiB version.
ATI Radeon HD 5870 (4 Bilder)
The interesting thing is, that, against our last report, the HD 5870 with 1024 MiB will not work with 825/1300 MHz, but with 850/1200 MHz. If this follows a small last-minute alternation or if the 825/1300 MHz are meant to be from the 2048 MiB version, we will not know until the launch day, which will still be September 23. The performance of the HD 5870 should not experience any major changes.
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