Asus P4S800D-E Deluxe & Gigabyte 8S655TX Ultra: SiS 655TX Challenges Intel's Bestby Wesley Fink on December 9, 2003 1:52 PM EST
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A Closer Look at SiS 655TXWhile AnandTech was impressed with the features and value of the earlier Gigabyte 655FX, the performance found was nothing to write home about. So what has SiS changed in the 655TX incarnation to improve performance?
The most significant performance improvement in the 655TX is the reduction in latency by removing half the command cycles from the communication between the CPU and memory. SiS claims that this brings memory performance to 865/875 levels, which would be significant indeed since the Intel memory controller is a very good performer for a chipset-based controller.
Other features of the 655TX are very close to the 655FX, but they are refined to be more competitive with current and upcoming Intel chipsets. The 655TX is also paired with the 964 South Bridge to offer SATA RAID and 8 USB 2.0 ports for a very contemporary feature set.
Full Prescott Compatibility655TX also fully supports FMB (Flexible Motherboard) 2.0 and VRM (Voltage Regulator Module) 10.0 specifications. This means full compatibility with upcoming Prescott processors. Both the Asus and Gigabyte manuals list Socket 478 Prescott processors as fully supported on their 655TX motherboards. Since there has been so much confusion and misinformation on the web about the new specifications, the FMB and VRM tables should help in better understanding what is required and the features provided in the new standards.
|FMB 1, 1.5, 2.0|
|CPU Code Support||FMB 1||FMB 1.5||FMB 2|
|Prescott VRD10||78A||91A||119A VRD10.1|
|VRM 10.0 VS VRM 9.0|
|VRM 10.0||VRM 9.0||Benefit of VRM 10.0|
|VID||6 bit||5 bit||More accurate voltage adjustment|
|Voltage Range||0.8375 - 1.6||1.1 - 1.85||Lower voltage
|Dynamic VID||Yes||No||Supports CPU that can change Voltage on the Fly|
SiS655TX SpecificationsAdvanced HyperStreaming™ Engine
High Performance Dual DDR Memory Controller
Support AGP 8X Interface
MuTIOL® 1G Delivering 1GB/s Bandwidth
SiS964 MuTIOL® 1G Media I/OMuTIOL® 1G Delivering 1GB/s Bandwidth
USB 2.0/1.1 Host Controller
Serial ATA Host Controller
PCI 2.3 Specification Compliance
Fast Ethernet/Home Networking Controller with MII Interface
Audio/Modem Controllers with AC'97 Interface
Advanced Power Management
Dual IDE Channels with Parallel ATA 133/100
LPC 1.1 Interface
Integrated Keyboard/PS2 Mouse Controller