I didn't know EDO went as fast as 200!
To clarify, SDRAM access time is defined as access time in burst mode, from a certain clock edge (clock latency). Typical access times for PC-100 SDRAM is about 7 ns., but this does not mean that PC-100 SDRAM is 7 times faster than 50 ns. EDO DRAM. When we compare 7 ns. to 70 ns., we are obviously comparing apples to oranges. So as to have a fair comparison, we need to convert the SDRAM access time to random access time.
Let’s see how much faster PC-100 SDRAM is as compared to 50 ns. EDO DRAM. The tRCD for PC-100 SDRAM is typically 2 clock cycles which is 20 ns. Presuming a CAS (tCAC) latency of 2 and an access time of 7 ns., the random access time is 20 + 17 = 37 ns. So a PC-100 module is about as fast as a 40 ns. EDO module for random access. In burst mode however, PC-100 SDRAM is faster than a 40 ns. EDO DRAM.
If I had all the money I spent on computer stuff that's now taking up space at the dump I could retire to Hawaii.
I feel your pain. Probably more like a new Honda Civic than a retirement in paradise tho. And this is coming from a guy who dropped a cool grand on a 2x cd-r burner back in 1996 (and 2x speed was a joke, it was just tempting the coaster gods to laugh at you). And $10 a blank unless you bought in bulk..... thousands of dollars just in optical media over the years. Good times.
Ok, so looking stuff up about EDO, it sould like it wasn't actually running at 66Mhz. That is just the max bus speed that EDO was specified to run at.
PC-66 SDRAM uses 10ns chips, while EDO uses 60, 50, 45, or 40ns chips.
It really sounds like EDO DIMMs run asynchronously from the bus speed.
Am I the only one here who actually used Burst EDO RAM?