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CPU HyperTransport Overclocking
CPU HyperTransport (HTT) bandwidth (speed) is an important contributing factor
to overall system performance. Its nominal effective bandwidth is 4 GBps running
at 1 GHz (200 MHz × 5) upstream and downstream. CPU HTT bandwidth is
directly proportional to CPU reference clock as mentioned earlier in CPU Reference
Clock on page 9. It defines how fast data propagates between PC devices and CPU
and system memory to maximize throughput. Furthermore, CPU HTT bus speed
has a tremendous impact on memory performance.
Use the following procedure to overclock CPU HyperTransport bandwidth:
1. Eliminate all sources of instability by configuring
settings as shown in Figure 8.
a) Lower the
b) Change
c) Set the
Figure 8.
In the
Note:
to
DU-02451-001_v01
05/17/06
NVIDIA nForce 590 SLI Technology Chipset Overclocking
to
CPU Multiplier
and to be safe a x8 multiplier will work; for other AM2 CPUs x5 will
work) in System Clocks BIOS menu.
CPU <-> nForce SPP
to
Ref Clock (HTT)
tune the CPU reference clock later using nTune.
System Clocks BIOS Configuration for CPU HTT
Overclocking
BIOS menu, make sure
Memory Timings
[DDR2 400]
as shown in Figure 4.
System Clocks
(for FX-62 CPU, this value is sufficient
x10
multiplier to
.
x5
as a starting point. You can fine-
200 MHz
Memory Clock Limit
BIOS
is set
15
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