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C2D v X2 = Not as good as you think?

Soldato
Joined
18 Oct 2002
Posts
10,445
Location
Behind you... Naked!
I have been running both my C2D and my x2 4200 into the ground to see which ones is going to be my main PC and which will be the mess about one.

I have had suspicions that the conroe ( Well, for those who want to argue, its the 6300 which is supposed to be an allendale, but its still a C2D )

Now, as you should all know, the conroe is twice as fast as the AMD. SuperPI will pretty much very this. On these 2 PCs as they stand right now for me, are giving me 17 seconds on the C2D and 33Seconds on the 4200, so with rought rounding off, the C2D is roughly about double the speed right?

Now, I would like anyone else who has both an AMD and a C2D to check this out... Cos I have also done these tests on other PCs too ( Single core Opteron / X2-3800 ) and its fairly surprising what you may find.

Ok, I run Folding At Home on both cores of the C2D and the X2, I also run utorrent too for my Lunix distro downloads.

Now, I have a load of Ghostfiles on DigiCam, that I am converting to DVD from AVI, and this is done using DVD Santa and this program uses both cores, I also use DVDtoONE, and TMPG DVD Author for the VOB files.

Naturally, this can all take a short while, and so while I am burning the last batch onto my 4 DVDRW Drives, I am converting the next batch, and of course I occasionally play a game or two while I am waiting.

Now, I have been doing this for a fair while now. I was able to do it just fine on my Barton Setup, on the NF7S Motherboard with 1GB of RAM, that would obviously slow the background apps down a little but at least they would be done in the hour. I moved to A64 and while the speed initially wasnt that much, encoding etc was massively improved.

Moving to C2D I expected that as SuperPI was giving me such a hike, I was rather hoping that encoding would alos have a hike too, but this has proved to be not as true as I was hoping.

It turns out, that while I can have a number of thigns going on at once, it seems that the AMD loves it, there is no ( Apparent ) slow down at all, and I can jumpo to andfromany running app I want to with no slowdowns, hangs or pauses, it is just as quick when using the Opteron too actually, but when using the C2D, its ploning along like a phart.

It seems to me, that the more apps you put into the C2D, the slower it gets. Now, I dont mean to sound thick here, I know that this is obvious, but hang on... Check it out, the C2D struggles when 2 apps are battling to do a job and when 3 or more are, it gets worse, while the AMD is still firing on all 4

A quick look at the CPU time in the task manager shows me something interesting...

FaH should only take up CPU time thats not being used right?

Well, on both the AMD and the Intel, I am seeing 50% twice. This is normal, as we know 50% of one core + 50% of the other core makes the 100% of both cores, and thats great, but then, when I run say, DVD Santa, then with FAH one core still gets about half the CPU time, just under actually, and so the FAH Clients still get roughly about 20-25% CPU time each. This does not happen on the AMDs... FAH gets 0%

So, DVDSanta, then on the Intel only actualyl gets to run at about half its potential speed, and on the AMD it gets to go at full pelt.

Result is that the AMD and the C2D are roughly finished at about the same time!

( I tested this and on one file in particular, the C2D was done in 18 minutes and the AMD in 17 Minutes )

Now, as I said, I like to run lots of apps at the same time, but lets just go to basics a little here...

When I am doing my usual jobs of encoding job B and burning job A, what would happen if I do some letters? I use StarOffice8, so I double click on the icon and wait. On the AMD, it comes up in 2 seconds... Not the quickest program to start I will admit, but hold on, how long does it take on the Intel?

9 seconds.

This MUST be because of the HDs being slow surely?

Nope!

The AMD is running 2 x Seagate 250GB SATA II Drives ( 2 partitions each )
The C2D is running a pair of 80GB Hitachi drives as Striped Raid, and a pair of WD200GB Drives and also my torrents are going to the 36GB Raptor.

HDTach is showing the Disk access of the C2D is pretty muchdouble of the AMD, so it cannot possibly be the speed of the disks.

I run good old simple notepad and its the same thing... absolutely instant on the AMD, and 3 seconds on the Intel??

So, it seems to me, that for when you are running one app or only need to use a PC for doing one thing very quickly, that the C2D are by far, the best option there is right now, however, if you plan on running a number of thigns that are all pushing for CPU time, then a C2D maybe isnt the best option?

As I said, I have also played about doing the very same jobs using a Single core Opteron 144 @ 2.6 and the opteron is also showing that its more than holding its own at particular tasks against the C2D, and that opteron does not lsow down as much as the C2D does either, but does lose out due to its single core.

So, can anyone else actually verify this for me, make sure its not just me who is finding this out.

As I said, when running or concentrating on one thing, the C2D is the beast to go for, but when loaded up with a few apps , the AMD is the better option.

Either way, for my needs, I am finding that after knocking out my Conroe setup, while Im absolutely in love with benchmark results, for the more serious stuff, I have actually gone back to my AMD and think that perhaps I wasted my time in some ways on going to conroe... Im just grateful that Im a hoarder and rarely sell any of my old kit off ( Hence currently owning 14 PCs )
 
Well, its interesting, but here there is no problem.

I can listen to music/watch DVDs/fold/encode/play SC/play any game at once and its fine.

A huge improvement over my 2.5ghx X2.

The fact your DVD Encoder is only using 50% on the C2D means its eithe windows isn't installed right or the software isn't installed right.

:confused:
 
i moved to a E6600 C2D from an overclocked 3800+ X2. the C2D is faster clock per clock but not that much. the real strength is in the overclocking headroom IMO

FatRakoon said:
Now, as you should all know, the conroe is twice as fast as the AMD. SuperPI will pretty much very this. On these 2 PCs as they stand right now for me, are giving me 17 seconds on the C2D and 33Seconds on the 4200, so with rought rounding off, the C2D is roughly about double the speed right?

it isn't twice as fast in general. superpi only shows that the conroe is faster at doing superpi. means nothing for programs that work in a different way. from reading XS it's mostly down to the cache i think. either way, it's not twice as fast.

if it were then when i encode videos, my encoding speed would have near doubled going from a 2.8 X2 to a 2.4 C2D. it didnt. its about 20-25% at most (without overclocking)
 
Is the x2 fast for what it is due to having two independent l2 caches rather than sharing it with the other core like on the c2d?

I mean fast for what it is by not being obviously as fast as a c2d but fast enough to play the latest games at decent resolution and detail without dropping frames.

Super Pi doesnt give the overal picture I found out from another post to the performance difference between the two. The only thing the c2d beats the x2 by a long way in, other than Super Pi is the si soft multi media benchmark from what I can see.

The x2 is still a very respectable CPU, even at stock IMO.
 
Very interesting post, and nice to hear of some real world benchies rather than the old super-pi crap that usually gets thrown about.

I've just got an E6600 rig that I'm probably going to put together around Christmas, and I was thinking of doing some tests against my Opty 170 @ 2.5Ghz rig to see if all the claims of it 'spanking' the AMD are really true.
Your post would suggest otherwise, at least when it comes to multitasking.

I'm almost tempted to get started on the new rig now. :p
 
i would suspect that the memory controller on the amd would play a part as the latency would be much smaller so it can access or give stuff to the cpu
 
Thanks for all the replies guys.

Ok, yes, I know that I said twice as fast... I did only mean in SuperPI, but also as a general too...

Clock speeds?

The C2D ( 6300 ) is currently at 415FSB
The x2 4200 is at 240FSB
The Opteron is at 290FSB

DVD Encoder using 50%?
No, 50% of each core... This means 100% of both cores

It drops down ONLY on the C2D and to be fair, only when Folding on both cores too! - stop FAH and I do indeed get the full sherbert, as long as nothign else is playing.

For sure, it is way quicker than the AMD. I never said it wasnt... I am saying that when I run many apps, it gets worse, while the AMD keeps on chugging along.

As easyrider says...
Opty 170 @ 2.8ghz 15 mins to shrink a DVD
E6600 @ 3.8ghz 3mins

Thats sweet cos mine dotn give anywhere near that much of a gap?

Now, throw a load of apps at the 2 PCs and you will find the gap between the two will be a lot smaller - Are you running FAH on each core or not?

Ok, the 3.8Ghz is way further apart than my AMD & Intel thats for sure, but I think you will find that with running several apps, the AMD time will be say 16 or 17 minutes which will be fairly obvious, but the Intel will be much higher, possibly even as much as 10 minutes.

And while you are doing all these, also try running other stuff too, and the AMD might just keep on loading stuff, while the Intel will take a lot longer to start up its apps.

Maybe with such a gap between them, you wont notice it quite as much, but I recon if you throw enough in, you will see what I mean.


I know there is a lot of points here that I am wrong about. I know the C2D is way quicker, I know this.

But, I also know that while I keep throwing stuff at these PCs, I know that the AMD drops in performance by say 5% but the Intels performance drops by much much more than that, meaning that by the time I have say 5 apps going at once, the AMD is doing its jobs much better than the Intel is... I dont just mean silly thigns either, I do mean proper work thats gettign the CPU to work, but as I said before, even notepad can take its time to startup on the intel.
 
FatRakoon said:
As easyrider says...
Opty 170 @ 2.8ghz 15 mins to shrink a DVD
E6600 @ 3.8ghz 3mins

Thats sweet cos mine dotn give anywhere near that much of a gap?

Now, throw a load of apps at the 2 PCs and you will find the gap between the two will be a lot smaller - Are you running FAH on each core or not?

Ok, the 3.8Ghz is way further apart than my AMD & Intel thats for sure, but I think you will find that with running several apps, the AMD time will be say 16 or 17 minutes which will be fairly obvious, but the Intel will be much higher, possibly even as much as 10 minutes.

And while you are doing all these, also try running other stuff too, and the AMD might just keep on loading stuff, while the Intel will take a lot longer to start up its apps.

Maybe with such a gap between them, you wont notice it quite as much, but I recon if you throw enough in, you will see what I mean.

This is really interesting and not something that is usually picked up in benchmarks are reviews. easyrider, are you able to play around with is stuff with your Intel and AMD system and confirm/deny any of these? I guess it's possible that there is some kind of configuration or setup problem with FatRakoon's Intel system but I can't imagine what it could be.
 
clv101 said:
I guess it's possible that there is some kind of configuration or setup problem with FatRakoon's Intel system but I can't imagine what it could be.


Yes, this is very possible, but I get similar results with my other DS3 too ( With a P4 660 Prescott @ 4.3 ).

When it started to lag, I decided to go RAID. this in itself has been a chore, and I eventually ended up intergrating the drivers into the installation CD, but apart from defragging it is quicker, I am finding that RAID on this ( or any other Mobo ) is pretty much a waste of time really. and anyway, this didnt cure the lag in loading apps.

Like I said running one thing, the C2D is way quicker...
Running 2 apps the gap is smaller and running more, this gap becomes wafer thin and eventually the AMD will take over it.

Ok, for 99.9% or us, this means jack No disguised swearing!, but I think I qualify into that 0.01% of users who do expect their PC to perform above and beyond.

Oh, and also when converting AVI to DVD, I have found that for some annoying reason, the end video file can be a little bit jerky when encoded on the intel. I cant figure this one out and surely there must be some reason behind this because any CPU can encode, Im not sure why it does this, but thats not for here... Not now.
 
Digital Punk said:
:eek:
Now I'm debating whether I should leave my Conroe kit unopened and just put it straight on ebay!

NO!

Im only having half a moan myself.

As I said, Im perfectly happy with my Conroe, its just that I was hoping for so much more...

Then again, when I went from the Winchester 3200 to the x2 3800 and found it was no better, I also had a whine at that...
When I went from the barton 3200 to the winchester 3200, I also had a moan at that...
When I went from... You get the idea!

The conroe is a dream CPU it really is.

You iwll find that it does everythign a lot faster than your AMD does it.

Its just that I tend to throw half a dozen apps at my PCs and I am finding too much lag when going between them, whereas I never have this with my AMDs.

Sure, it could be that my Intels are not setup right, and my AMDs are, but I doubt it, I have changed too much in the BIOS to not now know what does what to what and how for it to be a setting or two!
 
Sounds like you could do with some Quad core action! :p

I don't think I would have sold my new stuff anyway, I just hope I can see some good improvement when I switch to my new rig.
 
Digital Punk said:
Sounds like you could do with some Quad core action! :p


And how!

hehe... I've always wanted to say that.

Seriously, which is why I opeted for the kentsfield compatible option when I was chooseing the Mobo. Not sayign I will go for it when I can... Just that I have the option to, should I fancy it ( Or the missus let me )


Raikiri said:
No it doesn't. How can 50% of each = 100% of both?

Piccy - deleted for obvious reasons

100% will show as both graphs maxed out

You know what I mean... 50% in the task manager means that its 50% of the whole of the CPU power, or 100% of that core...

50% ( 100% of core 1 ) + 50% ( 100% of core 2 ) = 100% ( of the both cores )

I see what you mean, what I typed was not how I meant it to be...

I meant that Taskmanager was showing the core at 50%, meaning that it was 50% of the total, but, as we know this means 100% of that core.... Its how Taskmanager shows its figures.
 
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