BSNAMD’s Fusion Kaveri APU Supports GDDR5 Memory and PCIE3.0

Vesku

Diamond Member
Aug 25, 2005
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Given the generic nature of that thread, I'm fine with this as a topic.

So when GDDR5 is used it will be shared for the whole system? Could be very interesting for memory intensive applications.
 

lamedude

Golden Member
Jan 14, 2011
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I can get a low profile 7750 for $99. A mobo with 4GB of GDDR5 will probably carry a price premium >= than that and is not upgradable, and most programs will suffer from GDDR5's higher latency.
 

Soulkeeper

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Nov 23, 2001
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I can get a low profile 7750 for $99. A mobo with 4GB of GDDR5 will probably carry a price premium >= than that and is not upgradable, and most programs will suffer from GDDR5's higher latency.

latency is a function of both clock and timings, it won't be high.
Here are some timings for the gddr5 commonly used on radeon 7800 series. Those timings aren't that high, even if taking the upper ranges.
 

Torn Mind

Lifer
Nov 25, 2012
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It will be interesting to see how much laptops with these GDDR5 motherboards will go for.
 

SammichPG

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Aug 16, 2012
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4GB of gddr5 is a big limit, hope they find a way to bring it to 8gb.

If the HSA consortium succeeds this is the kind of system we'll be running in a few years (a discrete gpu has too much latency) even on high end builds with an external gpu used by few people like with sound cards.
 
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Vesku

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Aug 25, 2005
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Well, I think it's more of a gap filler as DDR4 probably won't be reasonably available until end of 2014 or later. A notebook with 4GB of DDR5 would be kind of cool.

As some people have said this may be mainly for special/embedded systems.
 

monstercameron

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Feb 12, 2013
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I know that amd cpus have had lower bandwidth than intels cpu(is it cache, or external memory? if external) so I am wondering what the effects of higher bandwidth would bo on an amd preocessor?
 

ViRGE

Elite Member, Moderator Emeritus
Oct 9, 1999
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Well, I think it's more of a gap filler as DDR4 probably won't be reasonably available until end of 2014 or later. A notebook with 4GB of DDR5 would be kind of cool.
I don't know about notebooks. The performance would be great, but GDDR5 goes the wrong direction on power consumption. At a time when notebook manufacturers are turning to DDR3L to shave off a couple of watts, going with GDDR5 may mean this gets pushed towards DTR and other form factors where battery life isn't a big concern.
 

Vesku

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Aug 25, 2005
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True, definitely was thinking more of the DTR style of notebook. Ones where the battery is just sort of there so it conforms to the definition.
 

zebrax2

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Nov 18, 2007
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If it is Kaveri i would be surprised. I'm thinking this is the cut down version of the CPU that will be used in PS4 since AMD has already said that they plan on releasing something along that vein
 

KompuKare

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Jul 28, 2009
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4GB limit. Hm, anyone nostalgic for chipRAM /fastRAM and similar things which were common with 16-bit home computers (mainly the Amiga but there were similar limits on the Atari TT etc.)?
 

Lonbjerg

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Dec 6, 2009
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assuming your talking to main memory, you would be wrong. Please dont use AIDA64 result to justify your position, thats a single thread memory benchmark ;) .

Don't let reality hit you in the face, perhaps you should look into the memory busses, lantency, prefecth ect....because Intel is mopping the floor with AMD...welcome to the real world.
 

jones377

Senior member
May 2, 2004
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I thought Kaveri was supposed to be on the FM2 socket? This doesn't make any sense.
 

NTMBK

Lifer
Nov 14, 2011
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I thought Kaveri was supposed to be on the FM2 socket? This doesn't make any sense.

Phenom II had a DDR2 and DDR3 memory controller on the same die. It's feasible this has DDR3 and GDDR5. They might only enable the GDDR5 memory in soldered boards (using a BGA laptop socket, not the desktop FM2).
 

itsmydamnation

Platinum Member
Feb 6, 2011
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Don't let reality hit you in the face, perhaps you should look into the memory busses, lantency, prefecth ect....because Intel is mopping the floor with AMD...welcome to the real world.

:rolleyes::rolleyes::rolleyes:


how about you learn to read

I know that amd cpus have had lower bandwidth than intels cpu

latency, sure that is measurable but what is the performance impact on a OOOE core with very deep buffers/queues with very large caches.


on prefetching anything to back that up, things like disabling software prefetching in Java because bulldozer does a better job doesn't backup your stance.

so next time you try to be smart *** how about getting a clue first.
 

pantsaregood

Senior member
Feb 13, 2011
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Providing more bandwidth to the CPU isn't really an issue. This has absolutely nothing to do with AMD vs. Intel.

The extra bandwidth is intended to allow the GPU to perform well. Fusion APUs have always been extremely sensitive to memory bandwidth; this is clearly an attempt to allow them to perform at their peak.
 

Olikan

Platinum Member
Sep 23, 2011
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mmm...that actually explains why AMD have like 16Mb from caches
 

Fox5

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Jan 31, 2005
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But for a DTR notebook, wouldnt you probably have a discrete card anyway?

It's lowering the price point of it. If people just want the cheapest system that can game, the $600 AMD + integrated 7850 is going to win out over the $750 Intel + discrete 7850.

But 4GB of ram max, ick. Needs to be at least 8.
 

sefsefsefsef

Senior member
Jun 21, 2007
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When the PS4 was announced there were tons of people saying "GDDR5 has higher latency than DDR3!!!11!!1!" Where did people get this notion? GDDR5 has no performance disadvantages for CPU workloads when compared to DDR3, only advantages. GDDR5 has more bandwidth and similar latency to DDR3.

Then again, there are no CPU workloads that really benefit from GDDR5 levels of bandwidth, so for CPU workloads using GDDR5 won't make any difference (good or bad), but it will help a ton with GPU workloads.
 

Olikan

Platinum Member
Sep 23, 2011
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When the PS4 was announced there were tons of people saying "GDDR5 has higher latency than DDR3!!!11!!1!" Where did people get this notion? GDDR5 has no performance disadvantages for CPU workloads when compared to DDR3, only advantages. GDDR5 has more bandwidth and similar latency to DDR3.

similar latency?

gimme a link please...
 

podspi

Golden Member
Jan 11, 2011
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It's lowering the price point of it. If people just want the cheapest system that can game, the $600 AMD + integrated 7850 is going to win out over the $750 Intel + discrete 7850.

But 4GB of ram max, ick. Needs to be at least 8.

I think 4gb is fine as long as such a system includes a decent SSD.