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[NH] Radeon HD 4000 specifications - Page 4

post #31 of 34
Quote:
Originally Posted by RonindeBeatrice View Post
You're exactly right. Baring some radical driver optimizations for SLI though it will be faster.
It could go either way like i said. This is exactly why AMD ditched the XTX,GT,GTX stuff, it causes confusion.
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Lee XT
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post #32 of 34
Quote:
Originally Posted by relic2279 View Post
Dude, you keep spouting this ignorance everywhere I see ya. (no offence) but I hate repeating myself.
Sigh... Here goes again:

Less shader processors = less money to make = cheaper card money wise. But if you can optimize your bus, architecture and memory bandwidth to push as much as you can out it's rear end, then you can equal the performace of a higher card for less money, AND less power usuage. In the video card world, memory bandwidth is everything. This link may give you some idea:

Source

Hope you spot the trend....

If your younger and don't get it, I'll give ya an analogy:
A Car with 8 cylinders and a Car with only 6 decide to race. Which do you think would win?

The one with the most horsepower and torque wins. Cylinders doesn't mean anything. Memory bandwidth is exactly that. Horsepower and torque. It's not something the videocard industry likes to talk about because for one, it's a weakness. People focus on 'oh the GPU is clocked at 3Ghz!! I'm gonna buy that FTW!' It's a selling point. Most (and obviously some here) have no clue what memory bandwidth is, or what it's used for... so why bother advertising it? Even my grandma knows how fast her CPU is though... THATS what their gonna focus on.
And thats exactly what the industry wants. Which is the stupidest thing someone could do. (without obviously checking the "horsepower" first)

Ignorance is bliss..



~R
Sorry for replying you a week after your post, but I saw it now...

So you say the memory bandwidth is the "horsepower" of the VC.
Why is that the HD 3870 which has 72GBit/s memory bandwidth twice slower than it's bigger brother 2900 XT w/ 128GBit/s bandwidth. In most cases it is the same performance, or little slower in bigger resolutions, but there are cases it's even faster? 72/128 = 0,5625 => There should be 50% downgrade in performance, but there is no such thing.

Why is that 2900XT(128Gbit/s & 512 bit bus) has almost the same performance with 8800GTX -> 86.4GBit/s which has 384bit memory bus width.
And didn't beat 8800Ultra /w ~103GBit/s.
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Ferberite
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post #33 of 34
Guy's the 3000 was to lower the power consumption of the 2000's.
post #34 of 34
IMO the 2900XT didn't have enough oomph to come even close of saturating the 512bit mem bus, so going 256bit for essentially the same shader power does make sense... it's also cheaper.

BTW, have you seen the 2900GT for 80$ on the egg? It's a bargain, even for a castrated R600 it'll demolish any 3650/8600 in the same $$$ range.
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