How Does Dual Core Work?

[drade]

Im getting A dual core amd as many people know, and i've been using single core for so long.

How does Dual Core exactly work?
Can you oc each core independent from the other or do they oc together?
What happens, if one core fries in overclocking , is a 3800+X2 then one 3000+, core is the processor then screwed up?

 

[rpg711]

ok for the first part of the question, dual core works kinda like cf, exept it uses one core to do something and the other to handle other threads... or it can be both cores focused on one thread, "doubling" the clock thus if u have a dual core 2.66 ghz, it is actually 5.32 ghz "dual"... basically its like dual channel memory. for the second part of ur question i dont get wat ur asking so plz rephrase it

 

[drade]

Meaning can you OC each core (2) of the dual core, or can you oc the whole thing, I cant really explain it

 

[rpg711]

u overclock the whole thing... its not really 2 chips, its just 2 basically 2 prescott cores squished together in one chip.

 

[gygabite]

so i told drade the question, you didnt get, i really want to know this:
if you oc a X2-3800+ so much, that one core burns (dies), is the processor usable like a 3000+ single core, or is the whole dualcore screwed up?

 

[rpg711]

i told u alredy... its a 2 core in one thing so its not really 2 chips, dies whatever... its basically wat i posted before... if u burn one u burn both

 

[Lekamies]

so i told drade the question, you didnt get, i really want to know this:
if you oc a X2-3800+ so much, that one core burns (dies), is the processor usable like a 3000+ single core, or is the whole dualcore screwed up?

Hard to say for sure... but some new a64 3700+ are x2 prossessors but second ("broken") core is displaed by factory... I lean in this matter information based some new "3700+ sandys" identify to toledo at cpuz not san diego and thos wont overclock so much than real san diego's

 

[Alec§taar]

Bit of humor...

TOPIC QUESTION: "How Does Dual Core Work?"

ANSWER: "Damn Well!"



* Use it here myself... love it!

APK

P.S.=> No humor now though: With the BEST system I've ever built, to date, imo!

That's of many systems "upgraded" to their possible max over time (probably a good 7 systems by now)...

(& this round, of AMD cpu nature!)

They have come a LONG ways, glad to be aboard again on them, in DualCore form no less (big fan of SMP for years now via Intel setups combined w/ Microsoft's NT-based OS' mostly (there was OS/2 & Linux here for a bit over time - SMP capable builds for them exist & I used 'em on Intel setups))... apk

 

[KennyT772]

actually the two cores run as one. the cores run at the same clock as they run off the same internal multiplyer and the external fsb. if u kill one core overclocking the cpu will be useless as the onboard logic wouldnt be able to function. all a dual core cpu really is a single die with two execution cores and their cache's. other then that there is one of everything else. you cannot however use two cores to execute a single thread as rpg said. if we could really do that then we would have pent d 920's spitting out superpi scores better then infareds presscot. amd and intel are however workng on reverse ht which turns the threading process from two cores to one as far as software is concerned and manages it on chip. but you will never be able to use both cores for a single thread.

 

[rpgbefore...]

isnt reverse ht alredy on am2 proccys? and also to alec: u no ur sig? well i would say that one comp COULD beat urs...this cpu with this mobowith this ramwith a scsi adapter with two of these hard disks with this crossfire ed card with this crossfire ready card with this case and add gpu waterblock, ramsinks, then a radiator, cpu waterblock, radiator, hd waterblock, radiator, hd waterblock radiator... half of mine is off topic i no but i just cant resist it anylonger

 

[Alec§taar]

isnt reverse ht alredy on am2 proccys? and also to alec: u no ur sig? well i would say that one comp COULD beat urs...this cpu with this mobowith this ramwith a scsi adapter with two of these hard disks with this crossfire ed card with this crossfire ready card with this case and add gpu waterblock, ramsinks, then a radiator, cpu waterblock, radiator, hd waterblock, radiator, hd waterblock radiator... half of mine is off topic i no but i just cant resist it anylonger

That WOULD be a "killer machine"!

I am sure if folks used UltraScSi Cheetah's of 15k rpm variety w/ an Adaptec High-End caching controller in RAID 0 (e.g.-> Adaptec PCI Express Serial Attached ScSi RAID 4805SAS - 128mb RAM ECC protected DDR2 Memory onboard)) & those other parts from ATI (x1900 crossfire video) & water cooling...?

It would take mine in various areas, especially on disk!

(By the way, that RAID SCSI adapter? It's near $1,000 per board... too much for my tastes, because my typical "threshold of pain" per-board is around $500-$600 (vidcards of high end etc.)).

Heck, keeping in mind about the area of disks?

Well, INSTG8R (using the new "perpendicular recording" Seagate disk, a single 1) beat my RAID 0 WD "Raptor 'X'" array in READ speeds, here:

http://forums.techpowerup.com/showthread.php?t=13650

(BY A HUGE MARGIN, no less... Oh, I beat it in CPU use & Seek/Access times (2-3 tests), but the point is there (and I didn't expect to lose a single test))...

* I suppose that point I'm trying to make here, is this (and, I've said it once before to someone else here no less, on this very point you are making) - there is ALWAYS someone faster than you, in SOME area... that's life!

APK

P.S.=> The point for me @ least is this: Build something you'll really LIKE for years to come, w/out "breaking your bank" & enjoy the heck out of it, because you "DID IT RIGHT" & all that! apk

 

[v-zero]

Latest news is that reverse/inverse HT doesn't exist I'm afraid lads and lasses...

 

[15th Warlock]

isnt reverse ht alredy on am2 proccys? and also to alec: u no ur sig? well i would say that one comp COULD beat urs...this cpu with this mobowith this ramwith a scsi adapter with two of these hard disks with this crossfire ed card with this crossfire ready card with this case and add gpu waterblock, ramsinks, then a radiator, cpu waterblock, radiator, hd waterblock, radiator, hd waterblock radiator... half of mine is off topic i no but i just cant resist it anylonger

Sorry but the so called "reverse HT" thing was a hoax...

Reverse Hyperthreading does not exist

 

[CjStaal]

I don't know if anyone actually answered his question or not yet

Dual cores work kinda like

|-------|-Pipelined--|-------|
|Core|-----------------|Core|
|____| -Pipelined-|____|
...|.........................|
Own Cache......Own Cache

But conroe works like

|-------|-Pipeline-|-------|
|Core|--Cache-- |core|
|____|-Pipeline-|____|

I think, something like that

 

[error_f0rce]

Here:
More than you ever wanted to know about multi cores: http://en.wikipedia.org/wiki/Dual_core

(i.e. I never know that Microsoft's Xbox 360 game console uses a triple core PowerPC microprocessor)

 

[gygabite]

thanks for the many replies, you all are so incredible awesome !

 

[Deleted member 3]

To keep this thread on topic and give some valid information.
-The cores have to run in sync. They are clocked at the same speeds with the same multiplier.
-They cannot run a thread together nor "double clock" that way like rpg claims.
-Single threaded applications don't run any better directly, however they won't stutter as much when you run other applications on the background.
-Multithreaded applications can become up to 1.8-1.9 times as fast under ideal circumstances.

-Frying a core would fry the whole thing in a true dual core chip. I assume this is true as well for 2 cores in a package solutions like the first Intel dual core chips.

 

[demonbrawn]

Can you list any examples of multi-threaded applications?

 

[Alec§taar]

Can you list any examples of multi-threaded applications?

Open up taskmgr.exe & be in its PROCESS Tab!

Then, hit its VIEW menu, select off COLUMNS submenu...

Then, choose to display THREADS, & have @ it!



* You'll see a TON, right off the bat, & what YOU use too!

(For games, I know that Quake 4 has an SMP build/patch & it has been reported to show up to 87% gains over singlethread original builds on an SMP/DualCore rig no less!)

You can now make your OWN determinations of that, with that tool!

APK

P.S.=> I don't have ANY 1 threaded things running here oddly enough... 2-22 threads shown each! apk