Nanosecond = 10^-9 seconds.
Megahertz = 10^6 cycles/ second => 10^-6 seconds/cycle

I don't see any inconsistency, Ken.

A microprocessor with a clock frequency of 100 megahertz will have a 10 nanosecond clock period.

Cal, from West Michigan

All generalizations are false, including this one..

Ken -

> I want to add more memory to my IBM T30 laptop.

This would be an IBM/Lenovo ThinkPad T30 Pentium 4-M 2366, 2367-xxx? But the "clock speed" (if you are referring to the CPU speed) should be 1.6 GHz or 2.4GHz (1600 MHz or 2400 MHz). Where did you get the 1993 MHz figure? Anyhow, if that's the model, it shipped with 128MB or 256MB. You can upgrade it to 1GB maximum, but there are only two memory slots. Depending on what you have installed, and where you want to go, you may have have to replace one or both of the current modules.

> the SO-DIMM memory available runs at 667 MHz. It is compatible?

I'm not sure what you mean by "compatible" in this context. Clearly the installed memory is compatible with your system. Other 667 MHz memory might not be. In fact, Crucial says your system uses PC2700 memory, which runs at 166 MHz. Notebooks can be particularly sensitive to memory. I'd strongly encourage you to buy any upgrades from a reputable source; if not Lenovo then Crucial or Kingston, and buy the memory modules they recommend for that particular system. The latter two offer a guarantee of compatibility and a lifetime warranty (not to mention their prices are probably less than Lenovo's.)

Good luck.

Kurt

Cal, your best bet for a fast competent answer is to call Kingston and Micron and see what each offers. They'll give you options and tell you which will be faster and by how much.

Then if you want to shop around other sources, you'll often find you can beat their prices by 5-10% BUT you may prefer to do as I did last time around, and pay the extra price because either of those folks will guarantee the chips work, ship you advance replacements if they don't, and typically offer a lifetime warranty. An overall package that is damned hard to beat.

They are both prime vendors, as good as it gets, and damned competitive in the larger picture.

Both Crucial and Kingston (www.kingston.com) offer memory for that model. You're correct that you can not install more than 1 GB of memory; the chipset for that module doesn't support more. You wrote that you currently have "786K". I think you meant 768 MB (that's with an "M", not a "K"). If that's the case, you have one 256 MB module and one 512 MB module installed. To get to the maximum 1 GB, you'll replace the 256 MB module with a 512 MB module.

> Photoshop has been slow and I think it was running out of available memory.

Yes, that application can get very greedy about memory. Depending on what you are doing, the extra 256 MB you can add may or may not make a difference.

Good luck.

Kurt

Here's the hardware manual which

Thanks for that. Yes, the memory access is easy. I had already upgraded from 250k (?) to 750K a few years ago. And there is Help software (Access Thinkpad.exe) that came on the HD with the machine that tells all about what the average user needs to know.

Gee, maybe with the hardware manual, I could install a larger HD myself? Instead of getting a new machine, I can get this one "retreaded".

One question. The manual talks a lot about replacing FRUs. What is a FRU?

Cal, from West Michigan

All generalizations are false, including this one..

Replacing hard drives are not difficult but you have to take some considerable care and ask a lot of advice before you buy one because for those older generations:

They have to be IDE drives and many if not most drives these days are SATA

There may well be a limit to the capacity of the drive which will be much less than the common drives these days.

If it's like my older Thinkpads then the raw drive sits in a drive carrier that fits into the PC and there is a link between the connections on the drive and the connections between the carrier and the PC since they are different.

And then there's a bit that you have to unscrew from the end of the carrier and fasten on the new carrier but in your case you will just be changing the drive within an existing carrier.

You should see all that in the manual.

But ASK ASK ASK

  Hugh

Great -- thanks for the feedback!

I've no idea if it is the case for your machine but with my Averatec 3715 the manufacturer's spec was a maximum RAM of 1GB but users found, and eventually Averatec agreed, that it could in fact take 2GB. So if you feel adventurous some time and get a cuple of 1GB stips ......

I'm still using the factory fitted 512MB alas since you have to strip the whole machine down to get far enough inside to access the RAM .... 13 screws of different lengths have to be removed and if you put the wrong one back into a hole you risk shorting something out .....

  Hugh

Seems unlikely the memory would cause your wireless link to fail. Try pulling out the new memory - if the link is still not working, I'd suspect it's a concidence and you need to look at what else may have changed.

Did the wireless link work immediately after the memory was installed? If the link has not worked since, you may have damaged or disconnected something while installing the memory.

Good luck.

Kurt

See my reply in your new discussion.

Kurt