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Maximum Shared Memory size in AMD Trinity per motherboard?

post #1 of 10
Thread Starter 
Hey guys, I have a pretty quick question, and I googled extensively and couldn't find the answer.
The maximum shared memory size for the gpu for the f2a85v pro mobo is 2048mb according to the spec page
http://www.asus.com/Motherboards/AMD_Socket_FM2/F2A85V_PRO/#specifications
but the asrock fm2a85x extreme6 says 512MB of shared memory max.
http://www.asrock.com/mb/overview.asp?cat=Specifications&Model=FM2A85X%20Extreme6

This guy on a newegg review said the 512mb limit was holding him back (although i doubt this is true). My GUESS is it has a dedicated amount from the ram and then uses system ram as needed. However, in the chance that this guy happens to be right, would the asrock board hold trinity back with less memory, and if it does, will Asrock update the BIOS?
post #2 of 10
Thread Starter 
Does anyone know? Will this affect performance? Thinking about jumping on the asrock tonight, but would like to know this before I do.
post #3 of 10
Thread Starter 
Confirmed in the bios of both boards after reading the manual, is that there is a UMA frame buffer size. You can set the uma frame buffer up to 2GB in the Asus motherboard and 512MB in the asrock one as per screen shots in the motherboard manuals.
This would definitely mean that asrock would be holding the graphics card back. Will they do a BIOS update?!? Or am i taking this the wrong way.
post #4 of 10
Bios wise it is 512 mb of ram shared.but i think amd is also correct.control alt delete will confirm this in store. Clerc might frown.(press the ignore button in your head)
post #5 of 10
Thread Starter 
Quote:
Originally Posted by drbaltazar View Post

Bios wise it is 512 mb of ram shared.but i think amd is also correct.control alt delete will confirm this in store. Clerc might frown.(press the ignore button in your head)
What i'm getting is amd control panel will allocate system memory to the gpu that isn't from the bios? +Rep btw.
Would this impact performance as the drivers would need to allocate ram on the fly as opposed to having a large dedicated memory bank?
Edited by flipmatthew - 10/15/12 at 6:36pm
post #6 of 10
I would get the one recommanded by amd (probably asus)why share iz important.in 32 bit oz you wont notice but in a 64 bit you will be able to grab said 2gb so if you have 8gb .2will be sharedwiththe apu the rest as you see fit.you wont get betterperformance per say.you will be able to play ressource hog game tho.the other thing is shared may sound faster since you might get the speed of ram but remember that ram are very far from apu.so in the end it will be like having 1000 speed at best.you arent gona get 1600/1600 .even tho it will say 1600/1600
post #7 of 10
Not sure since i got an intel mobo.but it should be a bios setting saying from 32 mb to its max value. But amd has a software that can do it if i recall its called fusion
post #8 of 10
More memory might help but APUs mostly benefit from faster memory. I believe the maximum they support is 1866 MHz so a 1866 MHz kit with tight timings would be perfect. Do I need to mention the Samsung "Wonder RAM"? rolleyes.gif
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by Snowmen View Post

More memory might help but APUs mostly benefit from faster memory. I believe the maximum they support is 1866 MHz so a 1866 MHz kit with tight timings would be perfect. Do I need to mention the Samsung "Wonder RAM"? rolleyes.gif
YESS
I am definitely getting that, was on the list from the begging. Most trinity mobo's support oc's of 2400mhz+. I was hoping to get the samsung ram to 2400mhz at 1.5v, if not that, then 2133 at stock timings @ 1.5v will work, right biggrin.gif! Sop excited for that RAM. so basically, 512mb will not limit me, and the drivers will dynamically allocate ram if need be?
Also what is the max safe voltage for samsung wodner ram. I have seen people get 2400mhz at stock timings or slightly looser (11-11-11-31 or 11-12-12-30) @ 1.5v and others at 1.57 or even 1.65v. Is 1.65v safe?
post #10 of 10
Quote:
Originally Posted by flipmatthew View Post

YESS
I am definitely getting that, was on the list from the begging. Most trinity mobo's support oc's of 2400mhz+. I was hoping to get the samsung ram to 2400mhz at 1.5v, if not that, then 2133 at stock timings @ 1.5v will work, right biggrin.gif! Sop excited for that RAM. so basically, 512mb will not limit me, and the drivers will dynamically allocate ram if need be?
Also what is the max safe voltage for samsung wodner ram. I have seen people get 2400mhz at stock timings or slightly looser (11-11-11-31 or 11-12-12-30) @ 1.5v and others at 1.57 or even 1.65v. Is 1.65v safe?

1,50 volts and 1,65 volts are the "default" voltages for DDR3 memory so there's no harm running the RAM at that voltage. Also, it's 30nm and therefore should be able to better sustain this voltage.
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