Graphic Aperture Size (GAS) Setting
Low Tech ECS motherboard powered by SIS735 intergrated chipset.
Memory PC2100 768MB
80GB WD HD
AGP MX2-400 with 64 MB
PCI MX2-200 with 32 MB
Span XP onto two displays with 1024 x 768 at 32 bit and 75 hz.
Discussion on GAS setting.
At 32MB the system locked all the time and MS XP was telling me its a driver related issue! Hum?
At 64MB the system locked at boot and at inconvenient times. (Like just as I complete a complex graph in excel and attempt a save and print. Lost work! Agh!)
At 124MB the system ran much faster with no XP lock up smoother graphics.
At 256MB the system just pops the graphics from websites with smooth game play. (Note: This still leave me with 512 MB for the system)
By using 256MB GAS setting the system is using the cashe more effectively. I am able to open multiple applications and write papers with graphics. It has not cause any slow down or lockup. In fact as I increased the GAS the CPU usage went up slightly with smoother operations. The system have been in operation for 1-1/2 years. I started to play with the GAS setting after the last MS update. Turns out its not completely driver related. Nvidia released a great universal driver that allowed spanning dual displays and used a lot of memory. It was causing problems because the CPU was getting the computation completed and had no where to dump the information. Once I increased the gas the task manager show much higher usage of cashe and cpu. I am using more of my system resources effectively. The online videos are streaming faster and games are streaming faster.
The more I read about GAS, I have come to the following conclusion.
1) Systems these days require a minimum of 512MB to run CPU and apps smoothly.
2) Graphics require 256MB to run smoothly, this is the GAS setting.
3) Sum total of minimum memory is 768MB.
4) Never allow the GAS to exeed 1/2 of the total system memory, this is a formula to crash and lock XP. It does one heck of a number when it loops the memory and lock the system. Only a hard exit and system reboot will get you out.
5) DON'T RUN GRAPHIC CARD MEMORIES GREATER THAN SYSTEM MEMORY! Where the heck is the system going to get the data to dump onto the graphic cards?
6) Systems should have the same amount of memory as graphic card for GAS + double that memory to the system itself to run apps.
Dual graphic cards with 128MB = 256MB
GAS = 256MB
System = 512MB Min. more the better.
I would like to read some comments and response.
Please don't run 512MB GAS with 256MB on graphic board and 128MB system memory.
Dual Graphics Low Tech!