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Obviously it depends on what is in it (ram, vid card, SSD, etc.). Stock: I picked one up for less than 400 locally.
 
Truthfully, I wouldn't invest more than $450 in one. So much old tech, What little power they still have must be compared to their remaining life span. (2 more years tops). After about 6 years, even macs begin to see higher rates of part failures. They may last longer than many pcs due to superior engineering but you have to remember certain rules of mechanical things. Heat over time = inevitable damage. Extensive use or non use = higher chances of issues. It's still not a bad machine but every relevant factor should be considered. They still make decent servers though.
 
Depends what you are planning on using it for?

If your anticipating updating OS X to the most current OS every year, consider that done.

If you fancy yourself a windows man/woman, then you still have yourself a pretty well advanced and fast machine.
 
At the very least it's worth its weight in aluminum.

I bought one recently and couldn't be more impressed. It's actually quite a jump from my c2d mbp 13 with discrete graphics, 8gigs of ram and a 120 ssd.

Whilst its an old machine I'm looking for ES chips for the final upgrade to push hex 3.2 with BSEL.

for many, including myself it will definitely hold out until the next upgrade, at which time I will go for a 4,1 or 5,1 dual.
 
something that is totally stock is going to command lower prices. Something with extensive professional upgrades will add value.
 
... So much old tech, What little power they still have must be compared to their remaining life span. (2 more years tops). ...

You don't really know what you are talking about, do you? These machines still outstrip most new non-Pro Macs due to the multiple processors. I know--I own a Pro 1,1 and have a new high-end Mini next to it. The mini is still struggling to be 1/4 as awesome as the old Pro.

You can jam in a few, faster processors and still have an excellent machine that will be good for about 4 more years. Add a SSD drive for the startup drive, and the system is screaming fast. Yes: it is now shut out of OSX upgrades, it has no USB 3, it has no Thunderbolt. However, the speed is still excellent, the Lion OS is perfectly fine, and there is plenty these machines can do for years coming due to the neutering of computing caused by iDevices in the last half-decade or so.

If you can get a Pro 1,1 for $450, you have a good deal if you love doing graphics, video editing, or almost anything else. Just upgrade with inexpensive parts to make it better.
 
You don't really know what you are talking about, do you? These machines still outstrip most new non-Pro Macs due to the multiple processors. I know--I own a Pro 1,1 and have a new high-end Mini next to it. The mini is still struggling to be 1/4 as awesome as the old Pro.

You can jam in a few, faster processors and still have an excellent machine that will be good for about 4 more years. Add a SSD drive for the startup drive, and the system is screaming fast. Yes: it is now shut out of OSX upgrades, it has no USB 3, it has no Thunderbolt. However, the speed is still excellent, the Lion OS is perfectly fine, and there is plenty these machines can do for years coming due to the neutering of computing caused by iDevices in the last half-decade or so.

If you can get a Pro 1,1 for $450, you have a good deal if you love doing graphics, video editing, or almost anything else. Just upgrade with inexpensive parts to make it better.

SATA II, The processors are quite old. You can upgrade to competitive tech but you do pay for that. You're locked out from future tech. You have the age old issues of heat on a machine over time. Are they still useful? Sure. I didn't say they weren't. However, acting as though they're screaming fast, or have a long life in front of them is being optimistic and assuming the seller spent a significant amount on upgrading them. Further, as I mentioned. Value goes up with the extensive upgrades, value sinks if its just a stock 6.5 year old machine...
 
You don't really know what you are talking about, do you? These machines still outstrip most new non-Pro Macs due to the multiple processors. I know--I own a Pro 1,1 and have a new high-end Mini next to it. The mini is still struggling to be 1/4 as awesome as the old Pro.

You can jam in a few, faster processors and still have an excellent machine that will be good for about 4 more years. Add a SSD drive for the startup drive, and the system is screaming fast. Yes: it is now shut out of OSX upgrades, it has no USB 3, it has no Thunderbolt. However, the speed is still excellent, the Lion OS is perfectly fine, and there is plenty these machines can do for years coming due to the neutering of computing caused by iDevices in the last half-decade or so.

If you can get a Pro 1,1 for $450, you have a good deal if you love doing graphics, video editing, or almost anything else. Just upgrade with inexpensive parts to make it better.

With 2 quad cores you make it about equivalent to an i5 2500/3570 (10,000 ish GB). An i7 2600/3770 will be faster (12,500-14,000 GB) and not have the "issues" that a 1,1 has. None of this makes them less awesome they're just not that fast.
 
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