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The Socket 939 Appreciation Club and Knowledgebase [Official] - Page 1869

post #18681 of 28751
So the theory is, if I am using the two HD 4870x2s in CrossfireX, I will have 2.75 GB of RAM (all four are mirrored, 1 GB total VRam), and if not in CrossfireX, I will have 1.75 GB of RAM (2 pairs are mirrored)?
     
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post #18682 of 28751
Quote:
Originally Posted by shadow_419 View Post
Blitz isn't entirely correct but not entirely wrong either. The total available/visible ram to 32 bit windows does decrease depending on how much vram there is, but two 4870x2's are only really using 1GB since the same information is mapped across all four 1GB vram buffers.
Example: 2 512MB cards in sli or xfire don't equal 1GB of vram but 512MB of vram with the same info on both cards.
I was thinking the same thing but don't have any proof to back up this idea other then to say that I have been told in several different threads that even though one might have 2x 1GB vid cards the total vid memory is still only going to be 1GB. I Never really understand why we have to use identical memory sizes on our video cards if we only get to use the amount of one card.
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post #18683 of 28751
Quote:
Originally Posted by thlnk3r View Post
Chrisme52, high voltages over time can shorten the life span of the processor. This is normally referred to as "Electromigration". Would a Opteron 180 be a wise upgrade? May be so. The Denmark core comes with 1MB of L2 cache on each core. Your Manchester only has 512KB of L2 cache per core. The difference in negligible and probably only noticeable in benchmarks but every little bit helps. In terms of overclocking it's kind of a hit and miss. The Manchester core requires quite a bit of voltage when you hit 2.6 - 2.7Ghz. The Opteron 180 has a nice multiplier to play with but typical overclocks with that processor haven't always been impressive not to mention the purchasing price will be high.
Thlnker, I personally notice a difference between the L2 caches. Clock for clock when comparing my opty 180 and my 3800x2, the 180 has noticeably less "stutter" at higher resolutions with all the bells and whistles on.

In regards to overclocking, it seems to me as though that most of the LCB*E steppings tend to overclock very well with little voltage. However, used ones might not fare so well especially if overheated.
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post #18684 of 28751
Thlnk3r: I agree with BlackOmega. The cache difference can be felt at the keyboard. Clock-for-clock, my Brisbane (512 KB) lost to my Toledo (1024 KB). The Brisbane's saving grace was that it could clock higher.
     
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post #18685 of 28751
Quote:
Originally Posted by blitz6804 View Post
Thlnk3r: I agree with BlackOmega. The cache difference can be felt at the keyboard. Clock-for-clock, my Brisbane (512 KB) lost to my Toledo (1024 KB). The Brisbane's saving grace was that it could clock higher.
Blitz, really? My Opteron 170 versus my Opteron 146 I really didn't notice a difference at the keyboard level. Maybe you guys are running different software that actually uses the L2 cache more efficiently?

Tator, I'll shoot you a PM with more questions. I'd rather not fill up this section with questions
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post #18686 of 28751
I am very hard-pressed to believe that Thlnk3r. (No offense.) Both have 1 MB cache per core, true, but the Opteron 146 lacks a core entirely.
     
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post #18687 of 28751
Quote:
Originally Posted by thlnk3r View Post
Shadow_419, do you have any MS documentation/links to sources ect that goes over this topic? I'm a little curious. Why would my system memory decrease depending on the vram size? Is this only noticeable on systems with video cards running 512MB+ memory? I never saw a change when I ran my 4850...
Sorry bud, but I can't find anything right now. I do know that when I went from a 7900gs 256MB to a 9800gt 512MB my total system ram in task manager dropped by 256MB (3.25GB vs. 3.5GB) in xp 32-bit.

Quote:
Originally Posted by N2Gaming View Post
I was thinking the same thing but don't have any proof to back up this idea other then to say that I have been told in several different threads that even though one might have 2x 1GB vid cards the total vid memory is still only going to be 1GB. I Never really understand why we have to use identical memory sizes on our video cards if we only get to use the amount of one card.
The reason vram doesn't double when running sli/xfire is because essentially each card is rendering the same frame. Therefore each card has to have the same data in vram. Sli/Xfire just split up the frame so that each card can finish the work faster. Instead of rendering the entire frame they each render half of the same frame and then display it as one frame. The faster the cards finish the more fps you get.
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post #18688 of 28751
So shadow_419, if you are doing AFR, would not then you have less RAM available? In AFR, each card is rendering its own frame and they take turns which one displays its frame next.
     
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post #18689 of 28751
thlnk3r, I know what you're saying. With my 3500+ it ran most everything, including most games, flawlessly. However, the more demanding games/applications there is a noticeable slowdown when there is a lot of action. It's most noticeable when going from a single core to a dual, it is still noticeable with different cache sizes, but not as much. Only with VERY intensive situations, like a 64 man server with lots of action at one time.
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post #18690 of 28751
Quote:
Originally Posted by shadow_419 View Post
The reason vram doesn't double when running sli/xfire is because essentially each card is rendering the same frame. Therefore each card has to have the same data in vram. Sli/Xfire just split up the frame so that each card can finish the work faster. Instead of rendering the entire frame they each render half of the same frame and then display it as one frame. The faster the cards finish the more fps you get.
Actually, that's not always true. My old 6800's do in fact combine their memory. It even shows up in GPUz as doubled when they're SLI'd.
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