Unofficial Austrumi Linux for English users forum golf & dvd

A Latvian and english Linux tiny operating system. used by golf & dvd lovers

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#1 2012-04-01 21:51:55

atang1
Administrator
Registered: 2006-03-30
Posts: 2705

Memory speed to help computer run faster ?

I have tried to run the 300 mhz computers faster. first by using wifi/b to download 600 kBps from the internet.

Then, remembering the speed increase easily done on new cpu using double the L2 cache size. We try to look at the memory speed such as FSB 66 mhz, 100 mhz and 133 mhz. But most memory is cl2 some even cl3. You have to believe that 100 mhz memory cl2 is 50 mhz clock compared with 66 mhz FSB clock. 133 mhz cl2 is as fast as 66 mhz speed.

But, you can be clever and think of the wait state advantage of speed.

If you set 100 mhz FSB the wait state of memory is 3 against the 300 mhz cpu. But the wait state of 66 mhz is almost five clock cycles. That is 2/3 of the speed of 100 mhz FSB. FSB of 133 mhz is wait state of about  2 on 300 mhz cpu.

So, if you replace 66 mhz drams with 133 mhz drams cl2 you can speed up almost double. and I can sense the faster cpu running with wifi/b internet surfing. The bootup time shortened too almost waiting half the time of 66 mhz drams.

So, wait state is very important consideration in managing speed of older computer. If you can set the wait state in bios do so, or let the bios do the wait state by using different dram speeds.

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2012-04-01 21:51:55

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#2 2013-09-29 22:34:19

atang1
Administrator
Registered: 2006-03-30
Posts: 2705

Re: Memory speed to help computer run faster ?

This theory of fooling around with memory and many sodimm to set up bios for speed is not new. In the old days we can adjust speed of cpu in the bios. Today, we have to let bios check your installed memory to set the speed of the cpu.

Often, 133 mhz memory even at cl3, will fail the bios, because cpu can not be overclocked. But 100 mhz bus do speed up against 66 mhz bus and memory.

I am using p100 cl2 on this Dell cpx 450 mhz cpu and its running faster than the original p66 memory. You have to test the p100 to see if you can use it?

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#3 2013-09-30 08:02:30

atang1
Administrator
Registered: 2006-03-30
Posts: 2705

Re: Memory speed to help computer run faster ?

Sodimm has three important specifications frequency of the bus 133, 100 and 66. Then the wait state cl2, cl3 or cl1 which is never mentioned. The other specification is the speed of ns delay 5,6,7.5 and 10. The ns delay is for matching equivalent circuit to the cpu. PII 450 mhz will be 7.5 ns. not good using 6 ns parts, which may cause data corruption by its noise. 10 ns is only good for 66 mhz bus, it is too slow.

So, to use the correct sodimm to set the bios condition for the bus sped,  wait state for pci bus and ns delay for data transfer; you will get a laptop that runs faster by overclocking from p66 to p100 multiply by 7 for original 450 mh cpu.

PII has external cache which is slower than the cpu. PIII is already p133, so no overclocking possible. P4 uses different memory system which I will experiment some day later and will report any findings. P4 motherboards do have hardware jumpers to watch out. Bios may have settings of FSB etc. So, its more complex even in the early days of P4.

P4 FSB are 133, 150 and 166 mhz for memory of 266, 333 ,444 and 533(DDR2) Pc2100. 2700, pc2-3200 etc.

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