ATI Radeon R600

R600 Technical Aspects 2

Custom Filter Anti-Aliasing

The R600 range have a new type of Anti-Aliasing called Custom Filter Anti-Aliasing (CFAA), featuring edge detect, narrow tent & wide tent filters to reduce texture shimming. Along with higher compression ratios for Multi-Sample Anti-Aliasing (MSAA).
The way CFAA works is different to the standard MSAA in that instead of using a box/grid to divide the screen and having samples taken from inside these boxes it uses an array of larger circular areas which allow overlapping and also better coverage.

CFAA supports programmable sample patterns & filters. It is also upgradable with driver updates which is one of the reasons why we could see some improvements in performance with each driver update.

It's worth noting that ATi's new implementation CFAA has quite a few good points to it (such as speeding up per-pixel samples on limited memory), but this technique could lead to actually a blurring of the image, rather than a sharpening and reducing jaggies. nVidia's implementation here shows it's strengths with a more precise implementation in it's QAA.


This is another advance in 3D hardware that was developed on the xbox360's GPU. Tesselation makes it easier for developers by creating a means of hardware smoothing. This means developers can have something which might look coarse and even not very detailed, the GPU will then do most of the work. The end product looks much more detailed and life-like. This also obviously works for terrains and helps in animation, converting primitive data into something beautifull.

512-bit memory interface

As mentioned earlier the Radeon 2900XT has the worlds first 512-bit memory interface, giving it a huge bandwidth boost. When comparing it to the X1900XT for example the 2900XT has over 2x the bandwidth (X1900XT 46.4GB/second)

The ATI Radeon™ HD 2900 Memory Controller
  • Worlds first 512-bit memory interface
  • Over 100GB/sec memory bandwidth
  • 512-bit 8-channel GDDR3/4 memory interface
  • Ring Bus Memory Controller
    • Fully distributed design with 1024-bit internal ring bus for memory reads and writes
    • Optimized for high performance HDR (High Dynamic Range) rendering at high display resolutions

ATI have talked about the ring-bus architecture before, but this time they've given their card 512 bits to play with - a worlds first. The ring-bus is a bi-directional approach to memory architecture meaning the data gets to where it needs to go by the shortest route, making it highly efficient. It's all about bandwidth here, and that's what GPU's really benefit from.

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Most Recent Comments

15-05-2007, 13:36:20

Well you have the Apogee (very soon we hope) so I would go for a Laing D5 (reliability and flow), though some would say different :D

As it's your GPU too you want a PA 120.3 for a RAD, but your case is tiny so perhaps you could fit a 120.2 to the back of your case

GPU = MCW60 - would fit most newer cards too so you have options

For the res I reckon those tube res look very cool and you may just be able to squeeze one in. If not then Alphacool do a sweet mini-res :)

Tubing is your choice but myself I prefer 1/2" :D

wowo just saw hams post - bargain of the week!

15-05-2007, 14:04:43

Just measured up and there is no way I could fit a 24mm in the top of my case, only other solutions are a 24mm on the back or a 36mm on the top.

15-05-2007, 14:59:00

Ok this is what I have come up with so far, I am planning on mounting a 240mm rad on the back of my case and having a 120mm rad my free cd bays.

So I would need the following:

Not sure on a pump yet and if I should have a reservoir.

Comments welcome.

15-05-2007, 15:01:30

I second the MCW60 for GPU, very good block.

Also I wouldn't bother w/cing the NB.

You'll need a reservoir, I like the XPSC ones which fit in the 5.25" drive bays, have a blue LED as well.

15-05-2007, 18:08:52

For a res i recomend the alphacool cape coolex 25, check my rig gallery for pics.
It looks nice and hold a fair bit of liquid and i have it mounted on the roof of my case. :D
Theres my input for what its worth. lol.

15-05-2007, 18:25:39

It looks like something that women would play with :eek:

I am just looking for something small to sit inside my case ;)

15-05-2007, 18:31:43

Micro rez?

15-05-2007, 21:38:03

Swiftech MCres micro :)
BTW Kempez, Laing reports that 4.3% of DDCs are breaking. 4.3 is high statistically but chances are, if you buy a DDC you will be fine. D5s break as well, just a week ago on XS someone's D5 broke :) and the majority of people there use DDC. The only pumps I would call reliable are iwaki and panworld, and even then, they still have a chance of breaking. IanY, a crazy guy on XS, says "don't trust the pump" and sticks like 7 pumps into his computer...
Oh and try to get a thermochill if you can, they're most effective. A thermochill PA120.2 keeps water temps at almost the same temps as an MCR320 or Coolrad 32t, BUT has almost 1/2 the restriction. And of course, PA120.3 mops the floor.

15-05-2007, 21:45:23

GoldenTiger is what I'm looking at personally, I'm using an X-Qpack which is a small-form-factor... I modded it to use normal ATX boards, so while space is tight, I think I can fit it mostly inside :eek:, I think it's about as small as you'll get for a well-performing kit.

16-05-2007, 19:32:23

serialk11r is what I'm looking at personally, I'm using an X-Qpack which is a small-form-factor... I modded it to use normal ATX boards, so while space is tight, I think I can fit it mostly inside :eek:, I think it's about as small as you'll get for a well-performing kit.

That will not bring you good performance no matter how much you wish it will or how much you want to think it will. The radiator is simply too small.

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