First post, by Bellator
Hello guys,
I want to do some upgrades to my working 486 PC:
- EXP8449 board (ALi M1487/89)
- 256 KB WB cache
- 2 x 8 MB 60 ns FPM RAM
- 5x86-133 MHz AMD CPU
Basically I wanted to set 512 KB of cache and 64 MB of EDO RAM (4 x 16 MB or 2 x 32 MB), as well as overclock it.
Have any of you tried those fake/chinese copy/rebranded ISSI SRAM that they sell in Aliexpress? I have just bought a pack of 10 pieces of ISSI IS61C1024-10N (one of them does not work) and I would like to compare results:
32 KB 15 ns Tag + 4 x 128 KB 10 ns ISSI Data:
- 33 Mhz: 2-1-1-1 timings work
- 40 Mhz: requires 3-2-2-2 (2-1-1-1 do not work)
- 50 Mhz: requires 4-2-2-2 timings (3-2-2-2 do not work)
Comparing to my old SRAM:
32 KB 15 ns Tag + 4 x 64 KB 15 ns Data:
- 33 Mhz: 2-1-1-1 timings work
- 40 Mhz: 2-1-1-1 timings work
- 50 Mhz: requires 4-2-2-2 timings (3-2-2-2 do not work)
And to this other configuration I have tried:
32 KB 15 ns Tag + 4 x 32 KB 20 ns Data:
- 33 Mhz: 2-1-1-1 timings work
- 40 Mhz: 2-1-1-1 timings work
- 50 Mhz: requires 4-2-2-2 timings (3-2-2-2 do not work)
Even the 20 ns SRAM does 2-1-1-1 at 40 MHz, while the 10 ns only does 3-2-2-2. I am a little bit disappointed. Have anyone got better results with these ISSI chips?
Thanks.