your System Memory
Updated on September 26, 2000 by Thomas
McGuire - Page 3/8
as RAM is a lot better performing than the Swapfile, it can
help a great deal to optimize your memory settings. Restart
your PC & enter the BIOS. The following settings,
generally contained in the Advanced
section, can greatly improve memory performance &/or
0/1, 2/3, 4/5 DRAM timing.
Use this to set the DRAM memory module timing. Most BIOSí
default to 10ns.
Other options available may be (depending on BIOS) 8ns,
Normal, Medium, Fast, Turbo.
Selecting a different setting may improve RAM performance,
but reduce stability. Turbo is the fastest setting; 10ns
is the slowest (& most stable).
With the VIA Apollo 133 based motherboards you have the
option to change SDRAM speed. Settings available are Host
CLK or +/-33.
Host CLK allows the SDRAM to run at the same speed as the
Ext. Clock (FSB). You can use the +/-33 in case you want to run the RAM slower/faster than the Ext.
Clock, e.g. If you Ext. Clock is 100Mhz you could use +33 to allow your SDRAM to run at 133Mhz. Which is a great option for those of you with PC 133 SDRAM.
Or alternatively you could run at a 133Mhz Ext. Clock while
your RAM runs at 100Mhz
by using the -33
setting. Or you could run PC133 RAM at 133Mhz on a 133Mhz
Ext. Clock (aka FSB) by using the Host CLK option. As you can see this option allows for a great deal
DRAM read latch.
The lower the
value for this the better the memory performance, although
stability may be affected. Higher values may improve system stability at the cost of
speculative leadoff. Enable this for better performance, althought it could
make your system less stable, disable
it if it does.
Hole At 15M-16M.
old add-in cards
need this enabled to work properly. If you have such a card
then enable this,
In the unlikely event you have ECC (Error Correcting
Code) memory installed then you should set this to ECC,
otherwise set it to non-ECC.
Most memory is non-ECC & not really recommended for most
users unless the need the added stability (but it is slower
when ECC is being used).
A high number
will increase performance of the system's SDRAM. Decrease
this if stability is affected.
to CAS delay.
This should be set to a low
number, although it is affected by the quality of you RAM,
so set it higher if you have any difficulties afterwards.
This is a DRAM optimization feature. If a memory read is
addressed to a location whose latest write is being held in
a buffer before being written to memory, the read is
satisfied through the buffer contents, & the read is not
sent to the DRAM. Set this to Enabled
for better memory performance.
For best memory performance set this to 4-bank/way, although
lower settings may help improve stability.
CAS Latency Time/SDRAM cycle length.
This sets the CAS
latency timing of the DRAM system memory access cycle
when SDRAM system memory is installed. Setting this to 2
will yield better performance, although may be less stable
if your SDRAM is not CAS2 rated. 3
is slower & should be used when SDRAM isn't CAS2 rated
or you want to improve stability. NOTE - CAS2 can
significantly improve performance in many ways.
When Enabled, all CPU cycles to SDRAM result in an All Banks Precharge
Command on the SDRAM interface. Setting this to Enabled should improve RAM performance. NOTE - When overclocking,
particularly when you have an AGP graphics card thatís
running at non-spec AGP bus speeds Disabling
this may improve stability.
you have finished tweaking these setting re-load Windows.
Now to optimize the Swapfile settings.
to next page !