Disregarding energy costs and heat production, cheapest way to mine bitcoin?

[Terikan]

Is it still ASICs?  Or is there any scenario where investing in older vid cards for very very cheap could produce faster results per $ invested?  Is there a chart anywhere that shows the GH capability of various vid cards?

[Noruka]

ASICs

vid cards for srypt

[nachius]

Here is what you are looking for but as mentioned ASICs for SHA256 and GPUs for scrypt.

https://en.bitcoin.it/wiki/Mining_hardware_comparison

[Terikan]

Here is what you are looking for but as mentioned ASICs for SHA256 and GPUs for scrypt.

https://en.bitcoin.it/wiki/Mining_hardware_comparison

Thanks, very interesting.

[shwoop]

I would suggest dropping this route of investigation.
Considering exponential increase in hashing power and efficiency gains from newer ASIC hardware all your GPU behemoth is going to do is act as one of the worlds least efficient space heaters.

If you do have access to free power and cheap/free graphics cards: I hear litecoin is doing rather well at the moment so you might want to throw GPU horsepower over there.