Yonah Core Duos are 64-bit?

[Dacalo]

64-bit?

 

[TuxDave]

Thanks to a little detective work, it?s been discovered that the processors, deep down inside, are actually 64-bit compatible.

I like how the 'detective work' that he's talking about it just a person giving speculations on why he believes Yonah is 64-bit compatible. I was hoping see if he was able to hack it and execute 64-bit specific code on Yonah.

 

[dmens]

forget it, it is fused off.

 

[stevty2889]

While it's quite possible it's built in, if it's fused off you aren't going to be able to use it. Just like hyperthreading was built in the whole time, but fused off, EM64T was built in to prescott the whole time, but was fused off until Intel was ready to turn it on, and Vanderpool was also built in to prescott.

 

[Whitneymuse]

The article on the IDF recently posted on Anandtech dated March 7, said that during the INTC demo, they took an operational Yonah CPU and popped in a Merom CPU just to show the compatibility. Merom will have have EMT64.

 

[PentiumIV]

Yonah doesn't have 64 bits. Merom has.

 

[Maximilian]

Originally posted by: stevty2889
While it's quite possible it's built in, if it's fused off you aren't going to be able to use it. Just like hyperthreading was built in the whole time, but fused off, EM64T was built in to prescott the whole time, but was fused off until Intel was ready to turn it on, and Vanderpool was also built in to prescott.

Yea, just thinking the exact thing about the old willamette & hyperthreading.

 

[Fox5]

The features may be there, but it doesn't mean they're functional. I'd imagine the reason these features are shut off is because they're either nonfunctional or too buggy, there's no benefit to Intel not enabling 64-bit at this point in time.

 

[kknd1967]

there is a power consumption issue

Originally posted by: Fox5
The features may be there, but it doesn't mean they're functional. I'd imagine the reason these features are shut off is because they're either nonfunctional or too buggy, there's no benefit to Intel not enabling 64-bit at this point in time.

 

[Fox5]

Originally posted by: kknd1967
there is a power consumption issue

Originally posted by: Fox5
The features may be there, but it doesn't mean they're functional. I'd imagine the reason these features are shut off is because they're either nonfunctional or too buggy, there's no benefit to Intel not enabling 64-bit at this point in time.

Unless they're running a 64 bit OS, the features wouldn't be utilized anyway, it's not like their 32 bit power consumption would go up because they're capable of running in 64 bit, and it's not like the competition has something better.

Plus, hyperthreading and EMT64 on the P4s definetely weren't disabled for a power consumption issue, sometimes things just don't work.

 

[Pr0phetX]

the yonahs in the macs are 64bit.

 

[Fox5]

Originally posted by: Pr0phetX
the yonahs in the macs are 64bit.

Are you sure? Because there is a 32 bit version of the Mac OS, and I think you can even check which version you're running within OSX.

 

[stevty2889]

Originally posted by: Pr0phetX
the yonahs in the macs are 64bit.

wrong

 

[Viditor]

Originally posted by: Pr0phetX
the yonahs in the macs are 64bit.

Guaranteed that they are not...

 

[Pr0phetX]

yeah maybe you guys are right. Not too familiar with macs. But i just thought i'd throw that out there, and see what you guys say. I read it somewhere on the xs forums, but i dont think its worth searching for since you guys would know better than me.

 

[Fox5]

Originally posted by: Pr0phetX
yeah maybe you guys are right. Not too familiar with macs. But i just thought i'd throw that out there, and see what you guys say. I read it somewhere on the xs forums, but i dont think its worth searching for since you guys would know better than me.

Lol, you could have at least qualified it with an "I think..." or "so I heard."

 

[dexvx]

Originally posted by: Fox5
The features may be there, but it doesn't mean they're functional. I'd imagine the reason these features are shut off is because they're either nonfunctional or too buggy, there's no benefit to Intel not enabling 64-bit at this point in time.

Wrong. They are most likely fully functional. The reason they are disabled is because Q&A for these features takes a long time.

 

[Viditor]

Originally posted by: dexvx

Originally posted by: Fox5
The features may be there, but it doesn't mean they're functional. I'd imagine the reason these features are shut off is because they're either nonfunctional or too buggy, there's no benefit to Intel not enabling 64-bit at this point in time.

Wrong. They are most likely fully functional. The reason they are disabled is because Q&A for these features takes a long time.

Actually, Intel has stated that 64bit adds too much power draw to Yonah...so they made a conscious decision not to include it. This makes sense because the main reason Yonah is so power efficient is that it's able to turn off sections that aren't being used very quickly. The 64bit extensions must remain on at all times, thus it would add significantly to the power profile of Yonah.

 

[JackPack]

If Yonah had working, fully functional EM64T, you can bet they would have turned it on for Sossaman (Xeon LV).

The server category is their bread and butter. If they could do it, Intel would have done it.

The power-draw argument is a weak one. If Yonah/Sossaman had EM64T, it would only add a few watts at most. Given that AMD's offerings only go down to 55W, even if EM64T adds a ridiculous 10W, Sossaman would still be 41W.

 

[dexvx]

Originally posted by: Viditor

Originally posted by: dexvx

Originally posted by: Fox5
The features may be there, but it doesn't mean they're functional. I'd imagine the reason these features are shut off is because they're either nonfunctional or too buggy, there's no benefit to Intel not enabling 64-bit at this point in time.

Wrong. They are most likely fully functional. The reason they are disabled is because Q&A for these features takes a long time.

Actually, Intel has stated that 64bit adds too much power draw to Yonah...so they made a conscious decision not to include it. This makes sense because the main reason Yonah is so power efficient is that it's able to turn off sections that aren't being used very quickly. The 64bit extensions must remain on at all times, thus it would add significantly to the power profile of Yonah.

I dont buy that. 64bit takes up less than 5% of total die space. Even with it always running, it would not generate so much power as to make the Yonah unfeasible. You have to remember that a Dual Core Yonah draws about as much power as the Single Core Dothan under load at the same clock, which is nothing short of amazing. Even if it were to draw an outrageous 20% more power with 64bit on, it would still put it far ahead of anything currently on the table.

Marketting answer = Too much Power draw.
Real reason = Not enough time to Q&A.