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Three days down… The server was down while administrators removed dead sites, in hopes of increasing performance. Performance does seem better, but time will tell… Let’s get on to some serious business.

More memory alphabet soup. JHR wrote in with a good question that I realized I haven’t answered: Can you use your existing plain, cheap old SDRAM on a new DDR-capable motherboard?

The answer, unfortunately, is usually no. DDR comes on 184-pin modules. SDRAM usually comes on 168-pin modules. A few companies, like Fujitsu and Apacer, have talked about putting SDRAM on 184-pin modules. It’s been mostly talk. The price difference between DDR and SDRAM isn’t enough to justify it.

There are a few boards, like the Asus A7A266 (reviewed at http://www.dansdata.com/a7a266.htm ), with both types of sockets for both types of memory. But the A7A266 isn’t the best performer out there, so you pay the price of convenience by buying speed instead. It’s a mediocre DDR performer and a terrible SDRAM performer.

It’s a shame to throw away memory, but this isn’t the first time. As recently as 1997, 72-pin EDO memory cost less than SDRAM. The 72-pin SIMM replaced the 30-pin SIMM as the type of memory to have in 1994, though 30-pin-capable boards remained available for upgraders through 1996. Before 30-pin SIMMs, there were all sorts of weird memory technologies, like 30-pin SIPPs, and different types of individual chips, which generally were a huge pain.

Usually when memory was replaced, adapters came out. There were SIMMs with sockets to plug old chips into. There were adapters to plug a SIPP into a SIMM socket. There were riser cards to allow you to plug 30-pin SIMMs into 72-pin slots. The problem was, they tended to hurt speed and stability, and in many cases they were nearly as expensive as new memory.

History’s repeating itself. There are adapters to let you plug DIMMs into RIMM sockets, and 168-to-184 sockets, though they’re expensive and hurt speed and stability, especially in the case of those RIMM adapters. There’s no point in using them.

I really should have been shouting louder that PC133’s time in the sun is over. The problem is, nobody knows for sure what will replace it. There’s DDR and Rambus, both of which perform really well in certain benchmarks, neither of which seem to make much difference in the real world yet. DDR’s pricing is very close to PC133, assuming you’re buying Crucial. Rambus is still priced way too high. I suspect DDR will win, but there’s no way to know.

It’s a shame to throw out memory, but there usually isn’t much we can do about it. If it makes you feel any better, PCs using SDRAM should be useful for a number of years. I’ve still got two systems with 72-pin SIMMs in them doing useful work for me. One’s a Compaq 486 I bought back in 1994 that just finished a tour of duty as a DSL router; its next incarnation will be as a file/print server if I can find an ISA SCSI card to put in it. I’ll probably also have it automate some parts of my network, courtesy of cron. The other one is a Pentium-120, which has done time as a file server and also as a testbed.

Anything new enough to have SDRAM is new enough to make a very useful Linux box, and it can also make a good Windows box, particularly if you scale it back to just do a handful of things very well. If I ever get around to retiring my K6-2/350, my sister would love to have it because it’d make a great word processing/web browsing/e-mail box–better than the Cyrix 233 she’s using right now, though she doesn’t complain much about that computer. That computer was built out of a bunch of stuff Tom Gatermann and I pulled out of our spare parts bins. And if I did make that switch for her, I know who’d get that Cyrix 233, and that person won’t be complaining either.

The key to responsible upgrading, I think, is to buy stuff that you’ll be able to recycle whenever possible. A good SCSI card and hard drive, though expensive, will be good enough to be worth recycling when you make your next motherboard upgrade. The same goes for a good monitor, and unless you’re a 3D gaming freak, the same goes for a good video card as well. My STB Velocity 128 video card, even though it has an ancient nVidia Riva128 chipset in it, is still fast for the games I play and frankly, it’s overkill for business use. I’ve had that card for three and a half years. I expect I’ll still be using it in three years. Heck, my Diamond Stealth 3D card is still useful. It won’t do justice for my 19-inch display, but it’s fast enough for routine work and it’ll drive a 17-inch monitor at 1024×768 at refresh rates and color depths that won’t embarrass you. And that card’s five years old. It cost me $119 at a time when low-end cards cost $59, and it’s still better for most things than the $40 cards of today. The $25 cards of today will give you higher color depth and sometimes better refresh rates, but they’re not as fast. So that card saved me money. My STB Velocity 128 and my Diamond Viper 770 haven’t been recycled yet, but I’ll get at least three more years’ use out of both of those, even if I turn into a flight simulator fiend. The 770 would be decent for flight sims, and both of them are outstanding for what I do now.

Everyone I know recycles good keyboards and mice, when they think to buy them.

You’ll generally replace motherboards and CPUs on every upgrade cycle. Depending on how often you upgrade, you can expect to replace memory every other cycle.

A lot of people are recommending you buy a motherboard capable of either type of memory, then buy cheap PC133 and upgrade later. But the performance difference isn’t great enough to justify that. If you think you’re going to want DDR, I recommend you just bite the bullet and get DDR. Crucial’s now selling 128 MB PC2100 DDR modules for under $65, so 256 MB of PC2100 costs slightly more than a mid-range video card.


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