Radeon HD 4650
There are no clear frequency specifications, so different manufacturers can equip such video cards with memory with an operating frequency of 800 or 1000 MHz, but all the same, this greatly reduces the memory bandwidth compared to the older model. The operating frequency of the RV730PRO chip is reduced and is at 600 MHz. The core has 320 stream processors, 32 texture units and 16 blending units. The basis for the success of this GPU lies in the fact that in terms of computing power it very closely matches the potential of the RV670, on which the Radeon HD3850 and Radeon HD3870 were based. It is noteworthy that both the RV670 and RV730 are manufactured according to the 55-nm process technology, but the power consumption and heat dissipation of the new chip are much lower.
Radeon HD 4650 supports hardware acceleration of HD video using ATI Avivo technology. The video card works via the high-speed PCI Express 2.0 interface. DirectX 10.1 is supported, unlike NVIDIA competitors, which only support DirectX 10.0. But this advantage is not significant due to the insufficient performance level for the new API. Unlike the senior video card, Radeon HD 4650 lacks CrossFire support.
ATI Radeon HD 4650 Specifications
| Name | Radeon HD 4650 |
| Core | RV730PRO |
| Process technology (µm) | 55 |
| Transistors (millions) | 514 |
| Core frequency | 600 |
| Memory operating frequency (DDR) | 500 (1000) |
| Bus and memory type | DDR2 128-bit |
| Bandwidth (Gb/s) | 16 |
| Unified shader units | 320 |
| Unified shader unit frequency | 600 |
| TMU on conveyor | 32 |
| ROP | 8 |
| Shader Model | 4.1 |
| Fill Rate (Mpix/s) | 4800 |
| Fill Rate (Mtex/s) | 19200 |
| DirectX | 10.1 |
| Memory Capacity | 512,1024 |
| Interface | PCIe 2.0 |
The Radeon HD 4650 turned out to be much weaker than the older model Radeon HD 4670. In some tests, the performance difference between these video cards is almost twofold. At the same time, the cards also have a twofold difference in memory frequency, only 800 MHz for the younger model and 2000 MHz for the older model. It seems that memory bandwidth greatly reduces the overall performance level and does not allow the RV730 graphics chip to fully realize its potential. In comparison with its direct competitor from NVIDIA, the situation is ambiguous. The GeForce 9500 GT sometimes outperforms the Radeon HD 4650, but in the most difficult tests it already shows lower results.