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Old 09-25-2017, 08:15 PM   #681
RJARRRPCGP
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Default Re: Your Best Dumpster Finds

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Originally Posted by momaka View Post
I've tested over 30 pairs of RAM modules on it, and they all passed.


I can, because I had a few RAM modules that I tested extensively many times and they always passed. I kept them for this exact reason - if this machine started misbehaving, I could always verify if it was the slots or not.
That's why the slot insertion limit looks like bullshit. The only connectors where I heard of a limit like that, are with the Intel LGA sockets, LOL.

Even then, there's a good chance that the socket 775 motherboard still will be stable even when I change the processor again...
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Old 09-25-2017, 09:02 PM   #682
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Default Re: Your Best Dumpster Finds

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now what CPU did you doubleclock from 600 to 1.2? I'm warming up the BS flag on that one.
Yep, the BS flag was already thrown here... A 600 Mhz OC usually wasn't possible until the Core 2! (Except for Pentium 4, of course) (Or at least an Athlon 64, at least with the 2004 or 2005 revision)

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Old 09-25-2017, 10:49 PM   #683
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Default Re: Your Best Dumpster Finds

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Yep, the BS flag was already thrown here... A 600 Mhz OC usually wasn't possible until the Core 2! (Except for Pentium 4, of course) (Or at least an Athlon 64, at least with the 2004 or 2005 revision)
And then we learn the CPU in question isn't even CISC. Intel
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Old 09-26-2017, 10:14 AM   #684
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Default Re: Your Best Dumpster Finds

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That's why the slot insertion limit looks like bullshit. The only connectors where I heard of a limit like that, are with the Intel LGA sockets, LOL.
<http://www.literature.molex.com/SQLImages/kelmscott/Molex/PDF_Images/987650-7881.PDF> 25 insertion cycles

<http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1-1773929-8_Memory_Socket_QRG&DocType=DS&DocLang=EN> 25 insertion cycles

<http://cdn.amphenol-icc.com/media/wysiwyg/files/documentation/datasheet/boardwiretoboard/bwb_ddr4.pdf> 25 insertion cycles

Three different manufacturers. And, these are "reputable" manufacturers. I'm sure folks making components geared specifically to the bottom feeders of the consumer kit market have worse performance (perhaps even using recycled/reconditioned components?).

If you consider the design of SIMM/DIMM sockets, the reason for the limit is pretty obvious: the connector relies on deforming metal "contacts" to make the electrical connection to the SIMM/DIMM. Each insertion cycle "exercises" the metal leading to eventual metal fatigue and failure.

Note that a contact need not "break" for the socket to have failed. Rather, if it loses a significant portion of its springiness, it may not be able to provide a solid enough connection to the finger on the module (i.e., higher mating ELECTRICAL resistance). Likewise, the manufacturer specifies the performance in a rang of environmental factors: temperature variation (hint: things expand and contract), vibration, etc.

How many times would a PC manufacturer expect a consumer to replace (reseat) the memory modules in their PC over its "lifetime"?

IT folks are largely ignorant of these limits -- "SEEMS like it is working..." Would you want the controller in the DaVinci robot performing your surgery to have sockets with that (poor) sort of "durability"?

[I designed a bit of kit that required the "memory module" to be removable dozens of times daily -- over the course of many operational years. The connectors cost $30. Each!]

As I said up-thread: you can undoubtedly encounter cases with much higher cycle counts. Just like you can run a 1.8V core at 1.9V. Or overclock a CPU.

Those of us charged with actually designing that kit, however, have to meet specific numerical targets for a product's performance. And, those targets apply over a range of operating conditions -- not cherry-picking some particular set of conditions to be most conducive to increasing some other design limit.

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Old 09-28-2017, 10:08 PM   #685
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Default Re: Your Best Dumpster Finds

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That's why the slot insertion limit looks like bullshit.
They are not bullshit. They are just a *minimum* *guaranteed* number of cycles before the slots *may* wear out.

It's like using a 1 Watt resistor to dissipate 1 Watt of power - it will handle it just fine. In fact, it typically takes almost two times its power rating to burn it out, and over a fairly long period of time too. But manufacturers do this so that they can give you a product rating and know that the product will meet it safely over various conditions, like CG mentioned above.

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Old 10-01-2017, 02:30 PM   #686
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They are not bullshit. They are just a *minimum* *guaranteed* number of cycles before the slots *may* wear out.
Said another way: if you use this component within these operating parameters (temperature, voltage, humidity, vibration, etc.) you can rely on getting at least this sort of durability.

So, when you publish specifications for your product, you can safely tell your customers that they can expect at least this level of quality. Some will end up getting better than that. Folks who get less than that will feel empowered to seek compensation (replacement, etc.)

In many industries, these minimums are essential (e.g., aerospace, medical, pharma, process control, etc.). And, few consumers would buy a product that claimed it might work as expected.

"This DIMM socket might allow you to insert a module 25 times..." (WTF?)

Unlike "sale prices" which are always "save up to X%" (but, you could end up saving 0% just as easily!)

"This DIMM socket allows up to 18,000,000 insertion cycles!" (but, you'll probably only get 27!)
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Old 10-04-2017, 09:20 AM   #687
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Default Re: Your Best Dumpster Finds

Not my own, but this dude has got to be the luckiest guy when it comes to dumpster finds:

http://www.eevblog.com/forum/blog/ee...ter-diving-pc/

I originally saw his video about this in YT and found his blog later on.

Makes me wanna fly to Australia and dumpster dive.

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Old 10-17-2017, 02:59 AM   #688
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Default Re: Your Best Dumpster Finds

back again with more crap ive found for free in the rubbish.
hp proliant dl380 g5 rack server complete with all ram and 2 HHD .works fine.
1150 socket i5 just missing HHD ,had blown power supply.works fine now
onkyo tx ds575 amp ,has a fault but still fixable
old ibm 5291 2 terminal .powers on still .
IBM personal computer 330-100dx4 complete with original IBM mouse and keyboard which ive bumped up the memory and using for old school games machine.
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Old 10-21-2017, 05:01 PM   #689
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Default Re: Your Best Dumpster Finds

This is a sampling of my "finds" recently... I've cleared about $5K usd since last Feb from two honey holes! Some truly amazing stuff.
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Old 10-21-2017, 05:10 PM   #690
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Default Re: Your Best Dumpster Finds

Here's another dose of my finds... There's a ton of stuff that I'm not showing mostly because I don't have pic's on this laptop (which I also pulled for free).
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Old 10-21-2017, 08:41 PM   #691
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Default Re: Your Best Dumpster Finds

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Originally Posted by jwillifixit View Post
This is a sampling of my "finds" recently... I've cleared about $5K usd since last Feb from two honey holes! Some truly amazing stuff.
It that flower a hibiscus? The weather has been reasonable around here and we would easily have plants blooming for longer...

And the white case with the purple button, the 5th one on the top, was the same kind of case that I had, when I had an Athlon T-bird, LOL.

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Old 10-21-2017, 09:18 PM   #692
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Default Re: Your Best Dumpster Finds

Why yes it is... Pic was taken about a month ago. Inventory of stuff to large to sell on fleabay got a bit overwhelming so i posted a garage sale ad on FB Marketplace. Ive had about a dozen sales of that ad.
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Old 10-21-2017, 11:30 PM   #693
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Why yes it is...
Just couldn't quite tell, because I didn't see those usual heart-shaped with toothed-edge leaves. The weather suddenly got better, but during the late season! I was wondering if everything was going to have trouble growing...
I thought I saw stunted corn earlier this year!
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Old 10-22-2017, 06:09 AM   #694
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Default Re: Your Best Dumpster Finds

that emerson reminded me .
found a lau reversible box and a wood mathes cooler on the curb at the same spot a few weeks back.both are easily fixed.as a bonus a deluxe portacolor.the one with clock/timer.i have plenty of practice repairing them from back in their era.
and just last week a pioneer sx-1250.
its pretty dirty but it will clean up.
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Here's another dose of my finds... There's a ton of stuff that I'm not showing mostly because I don't have pic's on this laptop (which I also pulled for free).
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Old 10-22-2017, 02:29 PM   #695
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and just last week a pioneer sx-1250.
its pretty dirty but it will clean up.
This was found this past April and is awaiting a good cleaning. It's working but seriously needs a wash!
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Old 10-22-2017, 05:48 PM   #696
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Default Re: Your Best Dumpster Finds

make lots of notes about how the tuner cord is routed & wrapped before you do anything else!!
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Old 10-25-2017, 10:10 AM   #697
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Default Re: Your Best Dumpster Finds

That Marantz amp/receiver looks awesome (minus the dirt, grime, and dust, of course ). I have a tape deck from the same era, and I absolutely love the brushed Aluminum looks of these types of older audio gear. They are well built too. I got my tape deck on eBay for only $10. It needed a tiny bit of work to get it going, but was totally worth it (it's actually worth well over $100 in working condition). Works great now. I would have recapped it too, but unfortunately these older electronics don't have the convenience of connectors and wire harnesses like newer stuff does. In the case of my tape deck and I see also your receiver, they use wire-wrap techniques to interconnect the boards inside. So that would mean cutting all wires and then re-wiring it again - i.e. PITA. But if you do that, you could retrofit it with new connectors and wire harnesses. It will just be a lot of work.

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Old 10-25-2017, 08:50 PM   #698
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Default Re: Your Best Dumpster Finds

I miss dumpster finds... This thread brings back the memories. Back when I was in college years and years ago, it was a ritual.

Now I live in the boonies and there's nothing good around here!
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Old 10-25-2017, 08:57 PM   #699
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Default Re: Your Best Dumpster Finds

A couple weeks ago I found a Dell Optiplex 980 tower with a i3 550 3.2GHZ,it was outside a car junkyard just needed a hard drive and she ran good.
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Old 11-06-2017, 01:25 PM   #700
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Default Re: Your Best Dumpster Finds

So I've been harvesting from two spots for the past 8 months now and have been ABSOLUTELY amazed by what I've found! That said I've made an observation - the general public is generally clueless when it comes to protecting personal data.

Most of the computers I pull are actually working or had a very simple failures with their only real issue being that they are old. In some cases all that is needed is a good cleaning and perhaps the ram needed to be re-seated or something like that. Worst case is a bad power supply or bad ram/card etc. Possibly bad caps but to be honest I've only found maybe 5 or 6 machines out of 100 that had obviously bad caps.

I just pulled in a computer the other day and found that it was working perfectly - fully intact including the hard drive. No passwords at all (not that it would protect anything anyway but still). Among other less interesting data this particular machine held the tax filings of 4 families for a period of 5 years.

What follows are some examples of what people did to retired computers before putting them in the dump... (while leaving the HDD's totally untouched).

1. cut the cables
2. smash the motherboard with something like a hammer
3. drill holes in anything that looks important (seriously... what are you thinking).
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