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View Full Version : 1,6 vs 2,0 ns Mem speed


AMC_Duke
06-14-04, 10:17 AM
Hey guys i need your Advice i want to buy a geforce 6800 ultra and i heard that there are 1,6 ns and 2,0 ns ones so i want to ask where is the difference and is it a noticeable difference between this speeds :rolleyes:

rewt
06-14-04, 10:19 AM
1,6 is what you would want. It'll give you much more overclocking headroom. And memory bandwidth will be much higher too!

MUYA
06-14-04, 10:20 AM
provided the PCB takes it ...cross talk issues etc. I think.

lowdog
06-14-04, 11:41 AM
Here is an email I received from nvidias technical marketing manager regarding my 6800U which has the GC20 2ns modules.


Thank you for your email.

Regarding your card's RAM: The memory has been fully tested and
certified by Samsung to run at 550MHz with sufficient margin.

Early in production, a limited number of memories were incorrectly
marked as 500MHz material.

To be sure, NVIDIA requested that Samsung retest the material and
certify its speed grade per the requirements of NVIDIA.

The RAM is not being overclocked, and has been fully tested and
certified to run at the 6800 Ultra-specified clocks.

We're confident your card carries the same reliability, stability, and
compatibility you expect from an NVIDIA product.

Thanks again for your interest in NVIDIA. If you have any more queries
I'll be happy to answer them for you.


Cheers
Tze Lin

--
Ong Tze Lin
Technical Marketing Manager
Asia-Pacific

NVIDIA Singapore
80 Marine Parade Rd #15-08
Parkway Parade, Singapore 449 269

T +65.6340.6825 F +65.6348.8110 M +65.9832.7125

tzelin@nvidia.com

AMC_Duke
06-14-04, 12:39 PM
Here is an email I received from nvidias technical marketing manager regarding my 6800U which has the GC20 2ns modules.


Thank you for your email.

Regarding your card's RAM: The memory has been fully tested and
certified by Samsung to run at 550MHz with sufficient margin.

Early in production, a limited number of memories were incorrectly
marked as 500MHz material.

To be sure, NVIDIA requested that Samsung retest the material and
certify its speed grade per the requirements of NVIDIA.

The RAM is not being overclocked, and has been fully tested and
certified to run at the 6800 Ultra-specified clocks.

We're confident your card carries the same reliability, stability, and
compatibility you expect from an NVIDIA product.

Thanks again for your interest in NVIDIA. If you have any more queries
I'll be happy to answer them for you.


Cheers
Tze Lin

--
Ong Tze Lin
Technical Marketing Manager
Asia-Pacific

NVIDIA Singapore
80 Marine Parade Rd #15-08
Parkway Parade, Singapore 449 269

T +65.6340.6825 F +65.6348.8110 M +65.9832.7125

tzelin@nvidia.com

thx thats a nice raply so it is just importand for overclocking =)

PS: What ultra u got Leadtek msi ... ?

lowdog
06-14-04, 12:44 PM
S-Media = Nvidia reference board.

AMC_Duke
06-14-04, 12:48 PM
S-Media = Nvidia reference board.

I go with the Inno3d 6800 ultra i think because its the first one here to be released and even this one is atleast 2-3 week away :retard:

SH64
06-14-04, 06:55 PM
The real question is how would you know if the manufacturer used 2.0ns or 1.6ns for the memory modules ?

Hereticiv
06-14-04, 07:15 PM
I guess when you try to overclock and if you comp freezes up you got the 2.0. Hey speaking of overclocking, will that void the BFG lifetime warranty, I just pre ordered one and I was wondering about this, my last card was an evga ti 4600 and they had no problem with overclocking, not to mention the BFG card is overclocked out of the box already. I just wanted to try and overclock the ram to 1200 and perhaps the gpu to 430 instead of 425 default OC for the BFG

SH64
06-14-04, 09:06 PM
I guess when you try to overclock and if you comp freezes up you got the 2.0.

Ok let me retype the question in differnet way :
how would you know if the manufacturer used 2.0ns or 1.6ns for the memory modules before you purchase the card ?

Rytr
06-14-04, 09:24 PM
Ok let me retype the question in differnet way :
how would you know if the manufacturer used 2.0ns or 1.6ns for the memory modules before you purchase the card ?

Samsung GDDR2 is labeled GC20 for 2.0ns (500MHz) and this is the ram that was apparently retested for Nvidia. They do have GC16 (1.6ns, 1.667, 600MHz rated) as well as GC14 and GC12 listed. Have not seen any of these yet. BTW, the GC12 is rated at 800MHz!

Clay
06-14-04, 09:28 PM
Ok let me retype the question in differnet way :
how would you know if the manufacturer used 2.0ns or 1.6ns for the memory modules before you purchase the card ?Right, good point. If one is patient, then a good way to find out is to read reviews. I always try to make a point of getting a good macro photo of the memory chips. I'll get the part number and confirm on Samsung (or other) websites as to exactly what the memory is rated at. Even then, though, it's no guarantee as different memory is sometimes used on the same video card product line over time.

Rytr
06-14-04, 09:52 PM
No way of knowing unless they post it in the specs and they have yet to do that. Still, it seems the ram on the 6800GT and Ultras have considerable headroom for GC20 rating. I would not be surprised if we did not start seeing GC16 ram appearing soon as the yields are apparently improving.

zakelwe
06-15-04, 01:37 AM
"The RAM is not being overclocked, and has been fully tested and
certified to run at the 6800 Ultra-specified clocks."

That's a new definition of not being overclocked. If it is rated at 2ns then by definition it is being overclocked if it is being run at 550MHz. That's the technical part, which is glossed over, the marketing part takes over and says how it will be reliable.

What they meant to say was, yes it was overclocked, but as it overclocks well it will be alright.


Regards

Andy

lowdog
06-15-04, 03:39 AM
[QUOTE=lowdog]

"Regarding your card's RAM: The memory has been fully tested and
certified by Samsung to run at 550MHz with sufficient margin.

Early in production, a limited number of memories were incorrectly
marked as 500MHz material.

To be sure, NVIDIA requested that Samsung retest the material and
certify its speed grade per the requirements of NVIDIA."


If I overclock these GC20 modules they will do 1.24GHz stable.

lowdog
06-15-04, 03:42 AM
Samsung GDDR2 is labeled GC20 for 2.0ns (500MHz) and this is the ram that was apparently retested for Nvidia. They do have GC16 (1.6ns, 1.667, 600MHz rated) as well as GC14 and GC12 listed. Have not seen any of these yet. BTW, the GC12 is rated at 800MHz!


It's actually GDDR3.

Rytr
06-15-04, 03:53 PM
Sorry, typo, thanks for catching that! :)

BTW, I have GDDR3 GC20 on my FX5700U and 540MHz is as high as I have run it for any length of time. Anything above 550 and I start getting artifacts but this does not seem consistent with the recent offerings of this ram on the 6800 series cards. I have read where several have gotten above 600MHz with this ram and I suppose it is the same GC20 just better yield and possibly the card has something to do with it too. :)