G74 560gtx

Please.. Could someone explain or post a link that explains the difference between 128 and 192 bit versions of 560GTX in G74. This is SOOOOO confusing: bestbuy model has 2GB 560GTX but it is worse than 1.5GB 560GTX from other vendors...??? And then, there are 1GB cards outher that are 1GB but are 192 bit... Please, someone knowlegeble explain this or post a link to an explanation outthere.

Many-many thanks for Your time

 

The 192 bit has more memory bandwidth compared to the 128 bit. Stock I think its 60gb/s vs 40gb/s. More memory bandwidth lets the card draw faster. Memory amount doesnt really matter as much, since it really wont get used unless you are playing at super high resolutions.

Just avoid the bestbuy version and find the laptop somewhere else. Laptop cards are already gimped, you don't want a gimped version of a laptop card.

 

okey, i understand 192bit is able "to draw" faster on memory to process more information.

1) but how is 2GB best buy version 560gtx is 128bit and 1.5GB version is 192bit?
2) how is it, that there are cards outhere that are 1GB and are 192bit/?
3) so bestbuy's card is bottlenecked by 2GB at 128bit (meaning its processing muscle is underused), but works at ITS FULL POTENTIAL with 1.5GB at 192bits?

I am sure I am not the only one who doesn't quite understands this. Please share your knowledge

 

Just avoid the bestbuy version and find the laptop somewhere else. Laptop cards are already gimped, you don't want a gimped version of a laptop card.[/QUOTE]

not all laptop cards are gimped. my 5870m is an overclocked desktop 5750!

 

Okay, so here's how it works.
The standard 560m gtx is supposed to be 192bit and have 6 memory chips. Each memory chip is connected to the core via a 32bit memory lane, so 6*32=192bit memory bus. The memory chips are either 256MB each or 512MB each, which totals to either 1.5GB or 3GB of VRAM. Keep in mind that the 3GB versions of the cards don't provide any performance boost over the 1.5GB cards, because the card isn't powerful enough to properly utilize 3GB.

The cheap versions of the 560m have only four memory chips, hence the 128bit memory bus. The chips are either 256MB or 512MB, so the cards either have 1GB or 2GB of RAM. These gimped cards are noticeably slower than the 192bit versions, because their memory bandwidth is 33% smaller. So it's best to avoid them.

All of the above applies to the 460m gtx as well, which is only differs in clock speed.

I have never seen a 192bit 1GB (or 2GB) card in a notebook. AFAIK, only one such card exists, and it's the desktop GTX 550 Ti, which is kind of an oddity. You can read about it here (keep in mind that 1G b=128M B).

 

sarge_ already explained all. Theres only one thing left: ROPs (Raster Operation).
Basically is what makes the gpu able to render content such colors, image, multi sampling and some quality effects.

The gimped gtx560/460m has less rops than the original (which is a BAD thing, almost on par with lesser bandwidth).

The "full" one is 192bit with 24 ROPs. The gimped one, beside the 128bit bus, should come with 16 or 8. Which is easy to understand that its below half the count of the full one.

Btw sarge: 1gb = 1280mb

 

no, it's not.
1 GB = 1024 MB
1 Gb = 128 MB
1 B = 8 b
know the difference between bits and Bytes.

 

not all laptop cards are gimped. my 5870m is an overclocked desktop 5750![/QUOTE]

That is exactly what I meant. All laptop cards are lesser than their desktop counterparts. Desktop 5870 > laptop 5870. People get a GTX560m, but they are really getting the equivalent of an underclocked 550ti.

 

Perfect answer! Exactly the explanation that clears and explains everything needed. Thank You very much SARGE. And thanks to Kingpinzero for going beyond the original question - I love to learn!

 

I have a question.

Does the 675/625/1350 192-bit, 24 ROPs GTX 460M outperform the 783/902/1566 128-bit, 16 ROPs GTS 450?

 

I'd say yes, yes it does. Especially when OC'ed.

 

Lol mate it was a joke since you wrote 1gb=128mb.
(hence the smile). No need to be upset

I know how it is (i dont believe im actually writing this):
1gb = 1024mb
1mb = 1024kb
1kb = 1024byte

Then if we talk about Bits, like gigabits, 1gigabit is roughly equal to 125mb, althought it's not applicable here when we talk about VRAM size or ram size in general, since it's measures in bytes.
I know you posted it because you were explaining the bus bandwidth which is infact expressed in Gigabits. Thats all
Then Gigabits and bits in general are used to measure streaming flux like broadband connections, mainly, or in this case bus bandwidth (hence data streaming capabilities).
But also 1gbit equals roughly to 125mb, which is not 128mb, thats why i joked on it.

 

So even though the GTS 450 has a much higher clock (especially memory), it still cannot keep up with the GTX 460m? Are you sure?

 

sarge is right man, because even with 100mhz or more on the core, the bandwidth will always be a problem. It can reach roughly the default 60gb/s it has the gtx460m.

Not to mention that the 460m can even reach up to 70-80gb/s of bandwidth when oced, which still kicks GTS450 back for good.

If we should make a comparison, its like a crippled 1gb gtx460m vs the full one, same thing.

 

Heres an example screenshot of my GTX460m in the G53 (it says 560m, but because ive modded the INF string, nothing much):

My original post is here; http://forum.notebookreview.com/asu...0096-gtx-460m-overclocking-6.html#post7855687

Note that this was with stock vbios, not overvolted. Right now my gtx460m is stable at 840/1670/1600 which is still higher in numbers that this old screenshot:


And this is the GTS450 "full" with 192bit bus:



As you can see even with higher default clocks, the gtx460m clocked at 814/1630 (which almost all the cards reach without overvolt) kicks the desktop version.
Also you may notice that the gtx460m (as well as the full 560m) have more ROPs than the GTS450.

EDIT: theres no 192bit GTS450. But still that should help.

 

I wrote 1G b=128M B, and that's exactly what I meant. b=bit, B=byte. 1Gb = 1024 Mb = 128 MB.
In data storage, 1Kb = 1024 b, 1Mb = 1024 Kb, 8Mb = 1MB = 1024KB.
In data transmission, 1Kbps = 1000bps, 1Mbps = 1000kbps, 1MBps = 8Mbps = 8000Kbps, 1Gbps = 125Mbps.

It is common to specify RAM and ROM chip capacity in bits. That article did exactly that. Don't believe me? Read the part no. of any RAM chip.

 

It's right there in your pic... "Bus Width: 128 Bit"
There's no such thing as a 192bit GTS450.

 

No no i never doubt your word, seriously. Im talking about this:

"Using the common byte size of 8 bits, 1 Gbit is equal to 125 megabytes (MB) or approximately 119 mebibytes (MiB)."

Is straight from Wikipedia, i just checked it. But ive already known it.

Dang, i didnt even realized, well your point is totally valid. Still i hope it should do for the comparison sake.