Upgrading AGP Graphics Processor; Dual vs. Single

So i just received a pair of old G4 towers. They're both AGP Graphics 400mhz machines, and i'm thinking of upgrading the processors on both. From what i understand from reading through the forums, they can take an OEM processor from some of the newer G4 towers. I've checked, and both machines have Uni-North numbers greater than 7 (one is 7, the other is 8), so they both can accept dual processors. Trying to weigh my options and decide what's best, taking into consideration that the bus on the AGP machine is only 100mhz compared to 133/167mhz bus on the faster processors...
1. Single 1ghz/933mhz/867mhz processor (will run underclocked)
2. Dual 500mhz processor (will run true @ 1ghz due to the 100mhz bus on the AGP machine)
2. Dual 1ghz/800mhz Processor (will run underclocked)
Thoughts? This would no doubt be a cheap upgrade, there are plenty of processors on eBay for under $100, and that makes it worthwhile for me.
Thanks in advance!

1. Single 1ghz/933mhz/867mhz processor (will run underclocked)
This will also require a 12v power modification to use a QS processor in a sawtooth.
2. Dual 500mhz processor (will run true @ 1ghz due to the 100mhz bus on the AGP machine)
This will run a true +500 MHz+, not 1 GHz. The dual processor just increases multi-thread processing ability. They do not double the clock speed.
But, this is a plug and play upgrade, and a nice improvement over a single 400 MHz processor.
2. Dual 1ghz/800mhz Processor (will run underclocked)
Again, there are voltage differences in the machine's which must be overcome.
You can find information on the actual modifications needed Here.
If you are capable of doing the mod work, I think it would be a fun project, and provide a boost to the old machines.

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