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Most soundcards designed for musicians manage signal-to-noise ratios of at least 100dB, giving less background noise on recordings. However, before you get too excited about not ever having to buy a soundcard again, it's best to bear in mind that a typical HDA motherboard codec will only offer A-D (recording) conversion with an 85dB signal-to-noise ratio. Finally, Intel's new HDA (High Definition Audio) replaces the now-archaic AC97 standard with support for up to eight channels of audio in formats of up to 24-bit/192kHz on the motherboard. Intel's Wireless Technology is also built into both chipsets, but sadly no-one has yet been able to test this aspect of them, because Intel don't yet have the feature working. MST also lets you use RAID 0 and RAID 1 on the same set of drives - so, for example, in a twin 200GB-drive setup you could create a 100GB RAID 0 (Stripe) array to achieve more simultaneous 24-bit/96kHz audio tracks, and devote the remaining space to a RAID 1 (Mirror) volume for extra security of other data. One is NCQ (Native Command Queuing), which executes hard-drive commands out of order if this results in fewer disk rotations or seeks to find particular data, but it's only currently supported by Seagate's Barracuda 7200.7 series. Both chips still support up to six PCI slots, but AGP support has been abandoned.įour SATA-150 ports and one PATA/100 IDE controller are available for attaching drives, and there's Intel's Matrix Storage Technology (MST), which supports two new features. The 915/925 both support PCI Express x16, using 16 lanes for up to 4GB/second bandwidth to and from the graphics card (ideal for Microsoft's forthcoming Longhorn operating system). For graphics work, multiple 'lanes' are used to increase this bandwidth still further.
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The PCI Express x1 expansion slots use a high-speed serial buss and are only about an inch long, but offer double the bandwidth of a standard PCI socket. In practice, most motherboard manufacturers will only provide DDR2 support with the 925X chipset and partner the 915P with DDR, for a significantly cheaper product. Only the 925X supports ECC (Error Correction Code) RAM for extra security, but the 915 chipset supports a slower 533MHz in addition to the 800MHz System buss, and slower (and cheaper) DDR400/333 memory as well as the faster DDR2 533/400 memory. DDR2 memory is more flexible than its predecessor, allowing (for instance) a pair of 256MB DIMMs to be paired with a single 512MB DIMM to run in interleaved dual-channel mode, and the memory controller supports a bandwidth of up to 8.5GB/second. Both support the new 800MHz LGA775 processors, dual-channel DDR2 memory, up to four PCI Express x1 slots, and one PCI Express x16 slot for the graphics card. The 925X chipset roughly replaces the existing 875P Canterwood, while the 915P replaces the 865P Springdale range. As with the Dothan processors discussed in last month's column, the new Pentium 4 models adopt a new and confusing numbering scheme, with the 2.8GHz version becoming the Pentium 4 520, while the the 3GHz, 3.2GHz, 3.4GHz and 3.6GHz models follow on as the 530, 540, 550 and 560 respectively. All of them use the Prescott core that Intel first introduced in their Pentium 4E processors to manage clock speeds higher than 3.6GHz, but apart from the new packaging nothing else has changed internally. Intel have already released a new 3.6GHz Pentium 4 model in the LGA775 package, along with repackaged versions of various other slower models. For musicians this is a possible plus, since it enables the use of a new heatsink and large-bladed fan that can apparently spin at lower speeds, and even stop if temperatures drop sufficiently. The extra 297 pins of LGA775 are mostly to supply power, and Intel have also improved thermal performance so that heat can be removed more efficiently. Motherboard manufacturers have apparently been complaining that this puts up the cost of their half of the assembly tenfold, although initial concerns about the socket's fragility seem largely unfounded. This is a completely new way of interfacing Pentium 4 processors to the system buss, and in a radical departure from previous designs it places the pins on the socket rather than the processor.
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Let's start with the new LGA775 (or Socket T) CPU socket. They herald the start of a new era for Intel-based PCs, with loads of new features. Intel's latest chipsets are finding their way into new PCs - but do they offer any advantages to the computer musician?Īs I write this at the end of June 2004, the first motherboards featuring Intel's new 915P (Grantsdale) and 925X (Alderwood) chipsets are appearing from manufacturers including Abit, Asus, Gigabyte, MSI and Intel themselves.
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