[QUOTE=davieddy;284507]The brutal fact is that CPUs have been rendered redundant for [B]any[/B] TF.[/QUOTE]

Everybody agreed with that already. However, we can't go very high with the factoring bit level, as the difficulty doubles for each step. I still do not understand what are you pleading for. Do you want to raise the TF bitlevels higher, or are you arguing that we are already TF-ing too high?

We should raise the bitlevel as long as we still can find factors faster then we would be able to clear the exponents by LL. The percent of factors is "somehow constant" per each bitlevel, but the time to do a bitlevel doubles every step. Right now we should not do any TF higher then 69 at the DC-front (<30M exponent). Even 69 is too much, as we can find a factor every 2 days in average, per GPU involved, and it would take shorter time just to do LL and clear the exponent, using the same GPU. For LL front (55M++ exponents), 72 bit is quite ok we find a factor every 2-3 days, or we could go higher, eventually 73 bits or more, we would still find a factor every 6-7 days in average, per GPU, saving 2 LL tests and some P-1, that would be about 10-12 days or more on the same GPU, saved. But it would make no sense to go higher, if we can't find a factor every 7-8 days maximum, in average, then better do LL directly.

If even me understood that, then it should not be so difficult to understand...

[QUOTE=Xyzzy;284012]In 5 years our GTX5900Ti Extreme "Limited Edition" liquid-nitrogen-cooled GPUs will trial factor all of those in a matter of a few days.[/QUOTE]

A' ye sure they won't be GTX[B]6[/B]90, or [B]7[/B]90? :P

[QUOTE=LaurV;284544]A' ye sure they won't be GTX[B]6[/B]90, or [B]7[/B]90? :P[/QUOTE]

"our GTX5900Ti" .....note extra zero. :smile:
Besides liquid nitrogen cooling, this hypothetical unit may also require its own fusion power plant to keep it cranking.

I noted the extra zero. THAT was the point. Why nVidia should change their habits?

[QUOTE=LaurV;284568]I noted the extra zero. THAT was the point. Why nVidia should change their habits?[/QUOTE]

hyperbole
[URL]http://dictionary.reference.com/browse/hyperbole[/URL]

which is not quite the same as the mathematical planar conic section: hyperbola
[url]http://dictionary.reference.com/browse/hyperbola[/url]

[QUOTE=LaurV;284568]I noted the extra zero. THAT was the point. Why nVidia should change their habits?[/QUOTE]

OK. I just figured that Xyzzy was projecting to a point at which the model numbers had gone up by an order of magnitude. Hence, the facetious reference to fusion power.

[QUOTE=S34960zz;284603]hyperbole
[URL="http://dictionary.reference.com/browse/hyperbole"][/URL][/QUOTE]
[URL="http://dictionary.reference.com/browse/intrudress?qsrc=2446&o=100074"]blearh! [/URL]

[QUOTE=LaurV;284543]Everybody agreed with that already. However, we can't go very high with the factoring bit level, as the difficulty doubles for each step. I still do not understand what are you pleading for. Do you want to raise the TF bitlevels higher, or are you arguing that we are already TF-ing too high?
[/QUOTE]

I mean two things.

1) DCs are about all that's left for the humble CPUs, so eager shithot CPU/GPU owning beavers should just let it ride.

2) If it's worth TFing DCs to N bits, it's worth TFing firstime LLs to N [B]PLUS FOUR.[/B]

Don't be embarrassed if you can't work out 2).
George himself slipped up on that one recently.

POTYmouth

PS and to repeat myself for the umpteenth time,
TFing a 350M expo to 66 bits is like "[B]PISSING INTO THE WIND[/B]"

Talking of getting too high...
...'66 is my favourite musical vintage.
[URL="http://www.youtube.com/watch?v=f4WeqP2G6pI"]Give me an F***[/URL]
What does that spell?

[QUOTE=davieddy;284695]
TFing a 350M expo to 66 bits is like "[B]PISSING INTO THE WIND[/B]"
[/QUOTE]

Right, both tasks are fun.:smile:

[QUOTE=davieddy;284695]
Give me an F**
What does that spell?[/QUOTE]
f-a-c-t-o-r
I thought you know already, you are member of mersenneforum longer then me....
But my factors I keep. They are not for you...
:P

[QUOTE=davieddy;284695]TFing a 350M expo to 66 bits is like "[B]PISSING INTO THE WIND[/B]"
[/QUOTE]

[QUOTE=Chuck;284705]Right, both tasks are fun.:smile:[/QUOTE]

I'm going to PM you to explain how much I treasure this reply.
Brace yourself:smile:

David