GF6800NU vs 6800GT?

[Hajime]

Got a fairly quick question.

I'm running a 6800NU @ 16x1/6 and 350core, with 700mhz ram.

Except for the ram, it is identical specs to a 6800GT.

However, a 6800GT completely hands my 6800NU it's ass - well, not completely. On average, I'd say a 6800GT gets 1700 or so points in '05 better than I. Similar benchmark results occur throughout my testing, from 3dmark03 to CS:S.

All from 400mhz ram.

Is there some fundamental difference in the 6800GT design? What's up there? Is it some fundamental difference in GDDR3 vs DDR design?

I don't see how -just- 400mhz would make such huge differences in 6800NU scores vs. 6800GT scores?

 

[stelleg151]

256mb

 

[Avalon]

That's why we softmodders OC the ram to make up most of the difference
My memory on my reference eVGA does 900mhz ;D

 

[uOpt]

To narrow this down you would have to run a 3D test which is know lot to overload 128 MB with textures. Doom3 medium quality comes to mind.

 

[Hajime]

I still don't see how 128mb of extra ram and 400mhz ram speed can make up the rather large performance gap, however...

Any articles? Information? Benchmarks?

 

[RealityTime]

here is the solution you seek







































if you want a 6800gt's performance. buy a 6800gt.

:beer:

 

[BFG10K]

Is there some fundamental difference in the 6800GT design?

Faster RAM, faster core and more pipes.

 

[Hajime]

Originally posted by: BFG10K

Is there some fundamental difference in the 6800GT design?

Faster RAM, faster core and more pipes.

I'm running a 6800NU @ 16x1/6 and 350core, with 700mhz ram.

Except for the ram, it is identical specs to a 6800GT.

 

[housecat]

Originally posted by: BFG10K

Is there some fundamental difference in the 6800GT design?

Faster RAM, faster core and more pipes.

 

[JBT]

You need to OC the ram to even try to catch a GT. 700Mhz is pretty limiting esspecially in high bandwidth situations. Also those programs might take advantage of having DOUBLE the ram...

 

[Hajime]

Hrm. That's odd.

I'd like to see a review on what varying amounts of ram do across similar architectures, but that might be a bit of a toughie....

Don't suppose they make 64mb Radeon 9600 Pro's or something? It'd be interesting to see an article/review on speeds across identical cards, save for ram (I.e. 64mb/128mb/256mb).

 

[jiffylube1024]

Originally posted by: Hajime
I still don't see how 128mb of extra ram and 400mhz ram speed can make up the rather large performance gap, however...

Any articles? Information? Benchmarks?

How the hell couldn't it narrow the gap? Those are the only differences between an unlocked/overclocked 16/6 350 MHz 6800nu and a 6800GT!

 

[Avalon]

You've pretty much voided your warranty by softmodding, so start overclocking that memory already!

 

[Hajime]

Originally posted by: jiffylube1024

Originally posted by: Hajime
I still don't see how 128mb of extra ram and 400mhz ram speed can make up the rather large performance gap, however...

Any articles? Information? Benchmarks?

How the hell couldn't it narrow the gap? Those are the only differences between an unlocked/overclocked 16/6 350 MHz 6800nu and a 6800GT!

Jiffylube: I see an average of 1.5k to 1.7k improvement in '05, as well as 15%-20% per differences average in benchmarks comparing this to a GT...

I'm stumped on -why- it doesn't narrow the gap. 400mhz mem and an additional 128mb of ram shouldn't have -that- much affect, right?

 

[JBT]

Originally posted by: Hajime

Originally posted by: jiffylube1024

Originally posted by: Hajime
I still don't see how 128mb of extra ram and 400mhz ram speed can make up the rather large performance gap, however...

Any articles? Information? Benchmarks?

How the hell couldn't it narrow the gap? Those are the only differences between an unlocked/overclocked 16/6 350 MHz 6800nu and a 6800GT!

Jiffylube: I see an average of 1.5k to 1.7k improvement in '05, as well as 15%-20% per differences average in benchmarks comparing this to a GT...

I'm stumped on -why- it doesn't narrow the gap. 400mhz mem and an additional 128mb of ram shouldn't have -that- much affect, right?

well apprently it does... I would say esspecially in 3dmark05.. I mean that program hands GT's thier own ass anyways. It is very stressful and obviously requires alot of memory bandwidth which your low clocked 6800 isn't getting with 700mhz and it also probably requires over 128MB of ram which since your card doesn't have that it is causing some texture thrashing causing your score to drop.

 

[jiffylube1024]

Originally posted by: Hajime

Originally posted by: jiffylube1024

Originally posted by: Hajime
I still don't see how 128mb of extra ram and 400mhz ram speed can make up the rather large performance gap, however...

Any articles? Information? Benchmarks?

How the hell couldn't it narrow the gap? Those are the only differences between an unlocked/overclocked 16/6 350 MHz 6800nu and a 6800GT!

Jiffylube: I see an average of 1.5k to 1.7k improvement in '05, as well as 15%-20% per differences average in benchmarks comparing this to a GT...

I'm stumped on -why- it doesn't narrow the gap. 400mhz mem and an additional 128mb of ram shouldn't have -that- much affect, right?

It does make that much of a difference - there's a reason there's a price premium on the GT's!

Not only do the 6800nu cards totally die and hit a wall at 1280X1024 with AA/AF (and especially above with AA/AF) due to memory bandwidth, but even in regular benchmarks and future-looking benchmarks like 3dmark 05, it is clear that both fast memory and more memory makes a large difference.