Best work choice for these machines

[henryzz]

Originally Posted by S485122

And degrading over time : all my Q6x00 machines started to give errors in Prime95 after a few years. I have not had that problem with DDR3 or DDR4. If memory serves all memory speeds above 800 MHz (*) were overclocked and my experience is that they didn't stay stable over time.

Jacob

My Q6600 remained stable throughout its lifetime(finally died in 2016). The big issue was that the memory controller was part of the motherboard. This reduced the maximum memory bandwidth to well below what you would theoretically expect. It did mean that with the correct motherboard you could run DDR3.

[kriesel]

Originally Posted by Prime95

The Radeon VII is so fast that it is the *only* upgrade worth considering.

If you can find it in acceptable condition at an acceptable price and get the purchase completed before it goes out of stock.