Memory chips have a certain bit-width. Graphic cards usually uses memory chips
with a bit-width of 32.
For example in the Radeon HD 58xx the GPU has a bit-width to the on board
memory of 256. In order to reach 256 bits you need 8 memory chips (8 times 32).
The size of memory chips comes in multiples of 2, thereof the doubling each time
you move up in memory size.
Last edited by Kej; 04-19-2010 at 02:18 PM. Reason: spelling
Last edited by RAID; 04-19-2010 at 12:19 PM.
@ Kej
Thanks for the explanation, is there a way around this design wise or are they stuck at doubling up?
the bitrate determines the number of chips, so 32bit per chip / 256bit bus = 8 ram chips for a 5870, if they put on a 384 bit bus, it would be 12 chips, and be 1.5GB, its very possible, but would add more heat and use up more space, and is needed for bigger chips, or for using slower chips, like the 480 uses.
ATI was fast ram smaller bus, nvidia was slow ram bigger bus and they both come out near the same.
going much higher than that is probably a bad idea though, the 2900 was 512bit and power hungry, and had a bandwidth of over 100GB/s, and was never really used effectively.
Thanks Manic, it certainly is good to learn the tech behind those fps
just got my retail 5870 SO - gotta love that Hynix memory on this card - running a smooth 1420mhz on the memory. GPU also not too shabby, doing 1040mhz with default voltage ( measured 1.18V).
Too bad no voltage adjustment with the retail card, 1.3V should do wonders!
No voltage adjustment? How about that Gigabyte OC utility to ajust vgpu and vmem?
Gigabyte SOC Tuner
Last edited by mike; 04-19-2010 at 09:25 PM.
glances over at my card, Hynix check
testing starts tomorrow![]()
Mine is now in Leipzig, wuhuu, now less then 1K miles from destination!
Competition ranking;
2005; Netbyte, Karise/Denmark #1 @ PiFast
2008; AOCM II, Minfeld/Germany #2 @ 01SE/AM3/8M (w. Oliver)
2009; AMD-OC, Viborg/Denmark #2 @ max freq Gigabyte TweaKING, Paris/France #4 @ 32M/01SE (w. Vanovich)
2010: Gigabyte P55, Hamburg/Germany #6 @ wprime 1024/SPI 1M (w. THC) AOCM III, Minfeld/Germany #6 @ 01SE/AM3/1M/8M (w. NeoForce)
Spectating;
2010; GOOC 2010 Many thanks to Gigabyte!
I would like to thank Eva & "mr interesting" ( hicookie ) from Gigabyteand give my first
to DHL for the delayed delivery and customs clearance.
Removing the card again to re-apply thermal paste and I'll give it a quick OC test on air before I start insulating it.
Coding 24/7... Limited forums/PMs time.
-Justice isn't blind, Justice is ashamed.
Many thanks to: Sue Wu, Yiwen Lin, Steven Kuo, Crystal Chen, Vivian Lien, Joe Chan, Sascha Krohn, Joe James, Dan Snyder, Amy Deng, Jack Peterson, Hank Peng, Mafalda Cogliani, Olivia Lee, Marta Piccoli, Mike Clements, Alex Ruedinger, Oliver Baltuch, Korinna Dieck, Steffen Eisentein, Francois Piednoel, Tanja Markovic, Cyril Pelupessy (R.I.P.), Juan J. Guerrero
Cool Bench!! Looking forward to this......hope you check out the Ocing software as well.
____________________________________________
More & more very expensive, quickly obsolete parts!!
Actually I'm currently looking for it
My card arrived in a foam box ( no accessories, package, CD ) and every single Gigabyte contact of mine is off-line or away
Maybe our humorous Australian buddy has it ? ( he must be sleeping now though)
Coding 24/7... Limited forums/PMs time.
-Justice isn't blind, Justice is ashamed.
Many thanks to: Sue Wu, Yiwen Lin, Steven Kuo, Crystal Chen, Vivian Lien, Joe Chan, Sascha Krohn, Joe James, Dan Snyder, Amy Deng, Jack Peterson, Hank Peng, Mafalda Cogliani, Olivia Lee, Marta Piccoli, Mike Clements, Alex Ruedinger, Oliver Baltuch, Korinna Dieck, Steffen Eisentein, Francois Piednoel, Tanja Markovic, Cyril Pelupessy (R.I.P.), Juan J. Guerrero
I will have to check the CD when I get home but I am reasonably sure the card does ship with the SOC Tuner.
what a bunch of babies, back in the day if you wanted more volts you had to get out the soldering iron!
Considering it sounds like a promo card from Gigabyte & probably has to be returned, soldering on it probably isn't a great idea. First you see what the card can do on air & use the software....then go cold & really use the software....... & one more thing, For those of us buying our gear, people don't want to buy a second hand card that has been modded.
Yup, the Ozzie is down...or pulling an all nighter, but Mike G has a card.
Last edited by Expat GriZ; 04-20-2010 at 05:42 AM. Reason: add comment
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More & more very expensive, quickly obsolete parts!!
[CENTER]The post counter is not an intelligence meter!Originally Posted by Massman
MAX11L - "It's like a console...with the suck turned down and the awesome turned up" -tet5uo
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