![[H]ardOCP](/images/blank.gif){kind=small}
- Date:
- Monday , April 25, 2005
- Author:
- Morry Teitelman
- Editor:
- Kyle Bennett
- Google +1
Shuttle SN25P
The SN25P is Shuttle’s endeavor in to the wonderful world of the nForce4 chipset. Read on to find out just how good a job they did with their latest Athlon64 based XPC.
BIOS (continued)
The Advanced Chipset Features menu contains various chipset related configuration options, including CPU frequency, an entire submenu dedicated to memory settings, and HyperTransport settings. The CPU FSB speed is settable using the CPU Frequency option. This option allows for a respectable 300MHz maximum CPU FSB. The HyperTransport link speed is set using the HT Frequency option. This option allows for a maximum 5x multiplier, which translates to a 1000MHz link speed with the CPU FSB set to the default 200MHz. The HT Width option sets the bandwidth for the HyperTransport link, with the 16 up and down setting giving the overall best performance. You also have the option of disabling the SSE and SSE2 CPU instruction sets through the SSE/SSE2 Instructions option.
The DRAM Configuration submenu contains all memory related timing and bus options for the board. Setting the Timing Mode option to Manual allows for manual configuration of all memory related options. The system memory speed is set using the Memclock index value (MHz) option. This option sets the memory speed using preconfigured ratios based on the default 200MHz CPU FSB speed. The settings available map to the following ratios, with the ratios listed in the form DDR FSB:CPU FSB: 100Mhz is 1:2; 133Mhz is 2:3; 166Mhz is 5:6; 200Mhz is 1:1; 216Mhz is 27:25; 233Mhz is 7:6; and 250Mhz is 5:4 .
The following memory timing options are user configurable: CAS latency; active to precharge delay (shown as Min RAS# active time(Tras)); RAS to CAS delay; RAS precharge delay; command rate (shown as 1T/2T Memory Timing); and memory register access and cacheability (shown as MTRR mapping mode). Note that on the memory timings listed, the numerically lower setting forces more aggressive memory operation. Note that for the H/W memory hole Remapping setting, you have the option to enable or disable only.
The Frequency/Voltage Control menu contains all options for configuring system voltage settings, as well as CPU speed related settings. The CPU Ratio option controls the controls the CPU multiplier, with a minimum multiplier of 4x allowed. The speed of the CPU is determined by multiplying the CPU Ratio setting by the CPU Frequency setting, which is located within the Advanced Chipset Features menu. The CPU Voltage Select option controls the amount of voltage supplied to your CPU, with an impressive 1.70V maximum allowed. The RAM Voltage Select option controls the power supplied to the DRAM modules. Again, Shuttle did not skimp on the voltage provided, with a respectable upper maximum of 2.9V allowed. The Chipset Voltage Select option controls the voltage supplied to the nForce4 chipset, with a maximum setting of 1.7V allowed.