To compensate the narrow memory bus graphics adapter can be achieved by increasing the operating frequency of memory modules. This situation is relevant for mobile accelerators, because of the inability to give the product a wide tire, install high-speed chips. Journalists site GPUcafe.com reviewed module MXM products Mobility Radeon HD 4860 marked the local memory. Marking type IDGV1G-05A1F1C-50X says that the GDDR5 memory has a nominal frequency of 1250 MHz or 5000 MHz QDR. With 128 bit bus, it provides a memory bandwidth of 80 Gb/s, which is higher than 61 Gb/s from the NVIDIA GeForce GTX 280M. Production of Qimonda memory modules are available on the market since the fourth quarter of 2008. In the desktop segment has long been used in the GDDR5 memory standard products Radeon HD 4870 512 MB, Radeon HD 4870 1 Gb and Radeon HD 4870 X2 2 GB. However, high-speed characteristics of such memory is far from impressive. There is nothing surprising, 256-bit memory bus to compensate for this. How to affect the availability of high-speed GDDR5 memory performance Mobility Radeon HD 4860 is yet to be know.