Asus P4T533-C and Intel D850EMV2 in the test: The new i850E with 533MHz FSB

Asus P4T533-C and Intel D850EMV2 in the test: The new i850E with 533MHz FSB


Own After our last review of the i850, i845D and SiS645 we only wanted to devote ourselves to the DDR-RAM representatives, as these currently have the larger buyers. With the release of the new Pentium4 with 133MHz FSB (533MHz QDR) and the associated test, a mainboard with an i850E chipset was already in our ranks. When we got the opportunity to also get the Asus P4T533-C with i850E before the official release, we threw the planning overboard and started again with the Rambus variants. But this time, too, we actually want to leave it with this one test in the future and then devote ourselves to the DDR RAM versions, which will soon be supplied with further chipsets.

But there is still some time and until then Let's take a closer look at the successor to the i850, the i850E.

The chipset

Even the name 'i850E' suggests morea revised version of the predecessor as a completely new development. And the fact that the i850E is only installed with the ICH2 (I/O controller hub) and not together with the new ICH4 gives reason to hope for few innovations.

But it is interesting why Intel, contrary to previous ones Rumor has it that the i850E is only equipped with the ICH2. Since the i850 and i850E are pin compatible, it is easy for motherboard manufacturers to use the new chip on their old boards without having to change the layout. That is why the decision was probably made by the mainboard manufacturers, as many use an NEC USB2.0 controller on their boards and can therefore do without the ICH4. This saves manufacturers the work of developing a new design. From Intel's point of view, the i850E could have been used together with the ICH4. The manual for our P4T533-C also shows that there was apparently no certainty for a long time. In some schemes, the ICH4 is still specified here and not the ICH2 that is ultimately used. This error will probably not be found in the final sales version.

The chipsets in comparison
Features Intel 850 Intel 850E Supported CPU socket Socket 423/478 Socket 478 multiprocessor Support no no Northbridge Intel KC82850 Intel KC82850E Southbridge Intel 82801 BA Intel 82801 BA Front-Side-Bus 100/(133) MHz 100/133MHz Memory clock 400MHz 400/(533) MHz Asynchronous memory clock yes yes (3: 4) FSB overclocking (each according to clock) up to 133MHz up to 150MHz max.number of rimming slots 4 4 max.memory 2048 2048 SDRAM support no no DDR-SDRAM support no no (dual) RAM bus support yes yes Ultra-DMA/33/66/100/133yes/yes/yes/no yes/yes/yes/no AGP 1x/2x/4x no/yes/yes no/yes/yes max.number of PCI slots 6 6 USB ports 4 4 USB 2.0 no no I/O -Link Hub Interface (266MB/s) Hub Interface (266MB/s)

Also in the table it becomes clear that the i850E is the only innovation with an FSB of 133MHz (533MHz QDR) brings. Officially, Intel's chip only supports PC800 Rambus. However, it is not a problem to use PC1066 as well, since each board can set the memory clock to 533MHz. So PC1066 Rambus is unofficially supported. This of course has the advantage that the 4.2GB/s data transfer, which the Pentium4 achieves with its new 533MHz FSB, is not limited to 3.2GB/s with the Rambus. With the PC1066 Rambus, the full 4.2GB/s are available and the balance between CPU and RAM is restored.

On the next page: The P4T533-C