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Intel Pentium 4 3.46GHz XE & 925XE
By CPU-zilla
Category : CPU
Published by Jimmy Tang on Tuesday, 2nd November, 2004

Intel Bumps the FSB to 1066MHz

There have been speculation over Intel's plans to bump the FSB to 1066MHz ever since the launch of the Springdale and Canterwood chipsets last year. However, that did not happen even though a lot of other motherboard manufacturers have successfully showed that it's possible to utilize the 865PE and 875P chipsets to achieve a stable front side bus speed at 1066MHz. Then, Intel was still pretty much set with the DDR400 standard and all they wanted then was to maintain a synchronous clock operation between the processor and memory bus.

However, with ever increasing clock speeds, the 800MHz front side bus was rather limited in its bandwidth and there was a need for higher clock speeds. Even AMD has increased their processor's HyperTransport bus speed from its initial introduction at 800MHz to 1GHz. It was only time that Intel moved it higher to further boost the processor's overall performance. In addition to that, the new high-speed DDR2 interface is really not maximized until the processor could feed it with enough data to take advantage of its higher data bandwidth. Could the new 1066MHz FSB do the trick here? We shall see that in the results section in the later pages.

Along with the new FSB speed bump, Intel is introducing a new chipset for the extreme enthusiasts and they have pumped the current 925X with steroids to give us the 925XE. The 925XE chipset is not much different from the 925X, except that it has been redesigned for the higher 1066MHz FSB clock speed and better speed path for low latency memory operation. As such, the 925XE is capable of supporting new DDR2-533 memory with a CAS Latency of 3. So far, only Corsair provides these low latency DDR2 memory modules, though we are certain other manufacturers would follow suit rather quickly.

Today, Intel also announced the availability of the new Pentium 4 Extreme Edition (P4XE) at 3.46GHz clocked at a whopping 3.46GHz. Since it's only about 60MHz faster than the previous P4XE processor, it's not surprising that Intel is still using the same 130nm part. In fact, it's the same processor with 2MB L3 cache except that it's just tweaked for the new front side bus speed.

Before we look at what some of the new motherboards are available in the market today, let's look at the processor technical specifications below:-

Intel Pentium 4 Processor Technical Specifications
Processor Number 560 NA NA
Processor Name Pentium 4 Pentium 4 Extreme Edition Pentium 4 Extreme Edition
Frequency (GHz) 3.60 3.40 3.46
Front Side Bus (MHz) 800 800 1066
L1 Cache (data + instruction) 16KB + 12KB 8KB + 12KB 8KB + 12KB
L2 Cache 1MB 512KB 512KB
L3 Cache - 2MB 2MB
Hyper-Threading Technology Yes Yes Yes
VID (V) 1.25 - 1.4 1.525 -1.6 1.525 -1.6
Icc (max) (A) 119 83.9 84.8
TDP (W) 115 109.6 110.7

Note that the processor is only available in the Socket-775 form factor. Looking at the specifications above, Intel has increased the TDP of the processor by a slight 1.1W, in view of the slightly increased clock speed. Everything else remains the same, as with the previous 3.4GHz part at 800MHz FSB. It's also useful to note that until today, Intel has yet to give the P4XE any appropriate model number.

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