Chipset Comparison Table

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  925XE 925X 915P
Processors Pentium 4 Pentium 4 Pentium 4, Celeron D
FSB Speed 200 MHz QDR
266 MHz QDR		 200 MHz QDR 200, 133 MHz QDR
Hyper Threading Supported Supported Supported
Max. Memory 4 GB (non-ECC only) 4 GB 4 GB
Memory Type DDR2-400, DDR2-533 DDR2-400, DDR2-533 DDR400, DDR2-400, DDR2-533
Memory Modes Single Or Dual Channel Single Or Dual Channel Single Or Dual Channel
Graphics PCI Express x16 PCI Express x16 PCI Express x16
PCI Express 4 Slots PCIe x1
1 Slot PCIe x16		 4 Slots PCIe x1
1 Slot PCIe x16		 4 Slots PCIe x1
1 Slot PCIe x16
PCI Slots 6 PCI 2.3 Bus Masters, 32 Bit 6 PCI 2.3 Bus Masters, 32 Bit 6 PCI 2.3 Bus Masters, 32 Bit
Storage Controller 1 UltraATA/100
4 SATA-150		 1 UltraATA/100
4 SATA-150		 1 UltraATA/100
4 SATA-150
USB Ports 8 USB 2.0 Ports 8 USB 2.0 Ports 8 USB 2.0 Ports
Network Interface 100 MBit MAC
GbE via PCIe		 100 MBit MAC
GbE via PCIe		 100 MBit MAC
GbE via PCIe
Audio Support HD Audio 24 Bit
192 kHz
AC97 2.3		 HD Audio 24 Bit
192 kHz
AC97 2.3		 HD Audio 24 Bit
192 kHz
AC97 2.3

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Memory Setups

FSB Ratio Memory
FSB800 1:1 DDRII-400
FSB800 1:1.33 DDRII-533
FSB800 1:1.5 DDRII-600
FSB1066 1:0.75 DDRII-400
FSB1066 1:1 DDRII-533
FSB1066 1:1.33 DDRII-711

While many people expected the 925XE to support DDR2-667 memory, Intel has stuck to DDR2-533. Faster memory would clearly have sped up the whole system - please see the benchmark section for details - but two reasons speak against early deployment of this technology. First, DDR2-667 is still much more expensive than DDR2-533. Second, running a 333 MHz memory interface clock for DDR2-667 would require operating the RAM asynchronously, something that Intel has always tried to avoid.

Despite Intel's decision, there is in fact a way to operate DDR2 memory far beyond DDR2-533 specs. By simply selecting the memory ratio that is required to match DDR2-533 when running FSB800, the memory will automatically run at DDR2-711 when the FSB is increased to FSB1066. In other words, when selecting the 1 to 1.33 ratio you would use to run DDR2-533 on FSB800, when you move to the 266 MHz FSB of FSB1066, you will be running the memory bus at 266 * 1.33 = 355.6 MHz, which means DDR2-711.

While you won't be able to operate DDR2-533 modules highly overclocked at DDR2-711, any branded DDR2-667 should be able to reach that speed easily. So far, we've tried modules from Corsair, Crucial and GeIL and easily hit the desired speeds with tolerant timings.


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