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View Full Version : VPU&Memo speed vs Pipelines&bits...which is more important?



Jase1
04-06-2004, 09:36 PM
Hi guys

Just realised this recently and found it a bit odd.

The Radeon 9800 Pro beats the Radeon 9600XT in nearly all the benchmarks there have been on the net. Even though the R9800Pro specs are all slower than the R9600XT. Eg R9800Pro VPU speed is at 380mhz while R9600XT VPU is at 500mhz. I mean thats a 120mhz difference... ?:| .

Oh btw, on Tomshardware's site (http://www6.tomshardware.com/graphic/20031229/index.html) why does it have R9600XT memo speed at 600mhz while its actually speed is at 300mhz and thats the same with R9800Pro, on the Tomshardware site it says 680mhz while its actual speed is at 330mhz. Both 300mhz and 330mhz speed came from the manufacture's website. Where did they (tomshardware) get the 600mhz and 680mhz from?

So back to the topic, thats a 120mhz difference. I mean doesn't VPU speed have any effect on its performence? I know R9800Pro has 8 pipelines, twice the amount of R9600XT. And also R9800Pro is a 256bit card while R9600XT is a 128bit card. But other than those two differences 9600XT's specs are all better than R9800Pro and yet R9800Pro perform far more better than 9600XT. ?:|

Does this mean VPU speed and Memory speed on video cards are only minor specs of a video card? And has no major big play on its acutal performance?


Any comments?

lagbort
05-06-2004, 09:03 AM
afaik the pipelines and 'bit' size of the gfx card play a huge part in how fast it is going to be (ie the 64bit radeon 9200 is absolutely caned by the 128bit model) however the Ram speed is probably the next most important factor, as if the ram isnt fast enough to supply everything else with the data then you aint going nowhere.

the vpu speed is RELATIVELY minor in the speed of things although you will be amazed what a little bit of overclocking can do ;)

" Oh btw, on Tomshardware's site why does it have R9600XT memo speed at 600mhz while its actually speed is at 300mhz and thats the same with R9800Pro, on the Tomshardware site it says 680mhz while its actual speed is at 330mhz. Both 300mhz and 330mhz speed came from the manufacture's website. Where did they (tomshardware) get the 600mhz and 680mhz from? "

Well on all newer cards they use DDR ram so you get double data rate, some sites show the 'full' speed of the ram and others show the true speed (ie the true speed is 300 but the effective speed is 600)

also dont be fooled by cards with 256mb of ram on them, they are generally slower than their 128mb counterparts (due to cheaper/ slower RAM)


so in short i would rank the important factors in this order

1) bit rating (ie 64bit 128bit 256bit)
2)pipelines (also taking into account the texture units per pipe, most radeon cards are 4x1 or8x1 arrangements whereas alot of nvidia cards have 2x2 or 4x2 arrangements (2 pipelines with the capacity to carry 2 pixels at a time each)
3) ram speed
4) vpu speed
5) the fancy colour of the pcb :p

Jase1
05-06-2004, 09:51 AM
I see i see ^^,so video cards are not like computers, where CPU speed and RAM are the most important (well one of the most important ones).

And also if no one mind me asking, if I was to buy a R9800Pro which brand should I go for? Powercolor? Gecube? Gigabytes or some other ones?

Btw why are almost all computer shops selling Gecube at low low prices? Is it b/c their company is quite new (on their site it said they've been in business for over 14 yrs and yet it is only since last year i started seeing Gecube in shops and online)? Are they any good like Powercolor?

lagbort
05-06-2004, 10:41 AM
afaik, because of the 'advanced' 6 or 8 layer pcb of the 9800 all 9800's are made by sapphire or ati because they are the only ones with the very expensive machinary to do it, so all 9800's are the same except for the ram used and the cooler on top

kiki
05-06-2004, 04:13 PM
Some of the Gecube ones are quite dodgy. They have various underclocked and overclocked video cards and its hard to know which one to get.

Look for one with Samsung 2.8ns memory and you'll have a good card :)

There was a big discussion in this forum (http://forums.overclockers.co.nz/showthread.php?s=&threadid=14805) a few weeks ago if you care to read. ;)

Jase1
05-06-2004, 08:32 PM
Thanks a lot guys for all your help ^^

fus1_n
05-06-2004, 09:09 PM
> Some of the Gecube ones are quite dodgy. They have
> various underclocked and overclocked video cards and
> its hard to know which one to get.

They so are. The reason they are cheep is because their manufacturing standards are very low. I have read reviews on them where they found certain gaurante stickers etc in between the gpu and the heat sink; ie in the thermal grease.

dont buy Chaintech either. My friend had one where the fan stoped working then he sent it back for a replacement and when he was playing a game the RAMsink fell off!

Jase1
05-06-2004, 10:44 PM
So is that why there are cheaper than the other brands. So GeCube and ChainTech are something to stay away from. Are there any other brands that I should look out for?

How is Powercolor and Gigabytes cards? I heard and seen quite a few reviews that Gigabytes cards are rather loud.