Radeon HD 4650 architecture
Last year AMD announced the Radeon HD 4650 and 4670.
Both products were released in the Q3 2008 timeframe. There is now a multitude of variations across the budget from a low-end to mid-range segment. AMD also introduced a lot of variations in the lower end 4000 series as you'll spot:
- Radeon HD 4670 (RV730XT) at 79 USD
- Radeon HD 4650 (RV730Pro) GDDR3 at 74 USD
- Radeon HD 4650 (RV730Pro) GDDR2 at 69 USD
- Radeon HD 4550 (RV710XT) GDDR3 at 45-55 USD
From top to bottom these products are based on a 146 mm2 55nm chip, with the UVD 2.0, DirectX 10.1 and 8 channel sound through HDMI. The entry-level 4500 based product will have 80 Shader (Stream) processors, all 4600 series products will have a far nicer 320 Shader processors.
The Radeon HD 4600 series will remain below 70 Watts power consumption, in fact you don't even need to connect it to a 6-pin PSU power connector. That reeks of good performance per wattage alright.
|
ATI Radeon |
ATI Radeon |
ATI Radeon HD 4650 |
ATI Radeon HD 3870 | |
| # of transistors |
965 million |
514 million |
514 million | 666 million |
|
Stream Processing Units |
800 |
320 |
320 | 320 |
|
Clock speed |
625 MHz |
750 MHz |
600 MHz | 775+ MHz |
|
Memory Clock |
2000 MHz GDDR3 (effective) |
2.0 GHz GDDR3 (effective) |
1.0 GHz GDDR2 (effective) | 2.25 GHz GDDR3 (effective) |
|
Math processing rate (Multiply Add) |
1000 GigaFLOPS |
480 GigaFLOPS |
480 GigaFLOPS | 384 GigaFLOPS |
|
Texture Units |
40 |
32 |
32 | 16 |
|
Render back-ends |
16 |
16 |
16 | 16 |
|
Memory |
512MB GDDR3 |
512MB GDDR3 |
512MB GDDR2 | 512MB GDDR3/4 |
|
Memory interface |
256-bit |
128-bit |
128-bit | 256-bit |
|
Fabrication process |
55nm |
55nm |
55nm | 55nm |
|
Power Consumption (peak) |
~110W |
~59W |
~59W | ~105W |
Above, a comparison scaled over the newer and older budget to mid-range products.
