a true power 550w could run an overclocked HD4870x2 just fine.

so how would it not be able to run an OCed HD4890?

my AC Accelero S1 mounting points don't fit my HD4770.

far enough to be obvious.

anyway, this one looks like the HD4770 3rd party cooler.

http://www.arctic-cooling.com/catalog/prod...256&language=en

but seriously la, the HD4770 is already so cooling, I don't see the need for 3rd party cooler.

like what? HD4850?

no point la. HD4770 itself also perform well already, much lower cost.

and you can still OC it, and even so the temps are very good even with ref heatsink!

i always stress test with furmark to see how far the heatsink can take.

long hour gaming doesn't push the heat level that high and fast like furmark.

stability test - yeah i'll use games.

when i sell off my HD4770 is when 9.5 released can't test CF already but can still test single card.

HD4890 still rawks.

either way also you get similar performance.

from my tests, HD4890 still lead in many cases.

I believe the HD4770 CF will lead if you have x16/x16 crossfire speed like X38 / X48 / X58 chipset but your board is on x8 / x8 which is like my P45.

sorry guys, my mistake to some extent........... but to say 16x/16 when crossfire isn't exactly correct too.

http://www.bit-tech.net/hardware/motherboa...si-790fx-gd70/3

apparently the x8 is only when all 4 is used. not entirely wrong though.



so yeah, CF 2 units - x16 / x16. CF 4 units x8 / x8.

chinook's Q&A is now at http://forum.lowyat.net/topic/1034734

---

Added on May 19, 2009, 12:05 amyeah which is why i stopped doing GC OCing. too little gain for so much time spent.

however, i must say that i found that cards like HD4830 did show quite some improvement with a little OCing.

i didn't OC the HD4770 btw.


This post has been edited by goldfries: May 19 2009, 12:05 AM

similar, actually HD4830 is more like the 9800GT.

i don't think it's a problem. my 550w i can CF the HD4890 + HD4830 (i didn't try with HD4850 yet) and it's all fine. so you're on 650w so that's plenty of headroom.

---

Added on May 25, 2009, 6:21 pmHD4830 straight.


This post has been edited by goldfries: May 25 2009, 06:21 PM

which setup? my readings taken from PSU wor.

ultimately still the HD4870 512mb will be faster than HD4850 1GB. just that the HD4850 1GB works a little faster than HD4850 512MB on higher res.......... but generally at higher res, the HD4850 core / mem speed and mem bandwidth will already bog it down compared to HD4870.

---

Added on May 29, 2009, 1:34 ambtw a point to note, comparing within same brand, HD4850 1GB is still a few hundred RM cheaper than HD4870 512MB. do you think the HD4850 1GB will still be faster? i don't think so.

This post has been edited by goldfries: May 29 2009, 01:34 AM

in case you guys missed it........



HD4770 and HD4830 is pretty close to HD4850, look at the HD4830 and HD4770 crossfire setup - matches the HD4890!

that's generalization - many games actually work fine with HD4870 on >20" reso. heck if you go by inches, it's not accurate either cos 22" also 1680x1050. some 21.5 are 1920x1080.

This post has been edited by goldfries: May 29 2009, 03:55 PM

k. like that then most cards also cannot la.

logical thinking is this.

if you spend a lot on monitor, meaning the reso is high.

then the graphic setup will also have to scale the same way in cost to achieve decent framerate.


yup - more RAM on higher ranked GPU sure got some advantage wan la.

usually 2x AA is fine, some games 4x AA also ok wan.

like what i mentioned earlier, if one spends that much on monitor, the spending on GC should scale along to cope with it.

RM 310 like that. Jetway.

POST = Power On Self Test.

yes, I have a HD4890 with me and when you on, it'll go sort of like full speed. then once the rest of the system kick in, it goes normal.

k. i is moves it back. LOL. i lz to explain how or why it happened.

HD4770 la. out already mah............