Hi, I would like to know whether my system will be running in single or dual channel mode? And, which one will benefits me more? More RAM size or more memory bandwidth? Please advice.![]()
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argyle_gargoyle Notebook Consultant
it will run in flex mode. it'll be like 4gb dual channel mode with 2 GB i reserve if needed.
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Actually, it will run just fine in the dual channel mode. The PM55 chipset will use the "dual channel" mode with two SIMMs... regardless of their sizes. So, there's no need to have "matched pairs" of RAM chips to make the dual channel feature work.
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I'd be interested in some evidence of this. I know the spec doesn't require identical DIMMs for dual channel to work, I've just never seen a system that actually supported it with different size modules. Not saying you aren't right, I'd just like to see some proof.
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What type of evidence do you need? I have 4+2GB modules.
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I just wanted documentation from Intel and/or proof that you're running in dual channel mode. Simply having them installed doesn't mean they're running dual channel.
Dual-channel architecture - Wikipedia, the free encyclopedia -
Megacharge Custom User Title
As far as I know they will run in Flex Mode, like argyle pointed out.
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Nope - Dual Channel.
Here you go.Attached Files:
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We cross-posted. Good to know it actually works somewhere as the original spec suggested, thanks.
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Megacharge Custom User Title
Nice, good news, I guess I'll be getting my 2nd R2 with 6GB of ram after all.
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2nd R2? One is not enough? o()
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Megacharge Custom User Title
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Hehe, nice one there. I'll probably upgrade slowly. A bit worried about the 5870's temps. 20% boost doesn't justify the 1/2 life span, IMHO.
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I hope your girlfriend reads this post...
YOU SHOULD GIVE HER THE LAPTOP FREE.Hope I stirred up some trouble for ya there...lol. j/k.
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Anyway, I'll wait and see more tests and benches done before thinking of upgrading. -
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So 2GB + 4GB will work on Dual Channel on PM55 but will it also work on previous platform - PM45?
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what does the bios report (Memory Channel Mode)? does it report dual channel too with the 4+2 config? I noticed the UK site offers 6GB dual channel but the aussie one omits the "dual" for the 6gb options.
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Just checked - BIOS reports dual channel as well.
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Cani upgrade to 16gb ram @ 1333mhz in M15x. 8GB each slot.
Possible not possible? -
I'm not aware of anything that requires(or can even utilize) 16gb of ram haha. -
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Kamin_Majere =][= Ordo Hereticus
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I love having 8 gb of ram and If I could I would get 16gb of ram and I would be loving it.
. But I learn how to use the extra ram.
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I believe that the PM55 chipset only supports up to 8GB of RAM.
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Yah, it would be nice to have 4 slots and put the fast HyperX 4x2GB. Unfortunately, those don't come in 4GB sticks.
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Does anybody know if there´s a performance gain/hit with the 4+2 option?
My laptop came with 2+4 and I just swapped them for the heck of it... -
Since it's been proven to run dual channel with 4+2, as long as you're not maxing the ram out, you'll see no difference going to 4+4 unless you buy ram with better timings, and even still your gains will likely hardly be noticeable.
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True.
I wish we could benefit from this though -
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According to Tom's Hardware
I think the only way we could really compare is by doing bench ourselves but even there it seems there is almost no difference in between the best RAM and the worst.
Full RAM comparison review -
Attached Files:
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Do you think that "programmable CAS latency : 5,7...10" is just another marketing BS?
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Not sure if the memory architecture has changed on the newer platforms but:
4+2gb is asymmetrical dual channel (aka Intel flex mode)
4+4gb is symmetrical (true) dual channel
A 4gb single stick is single channel
If your running 4 + 2 gb sticks on flex mode, the common size on both sticks (2gb) will run dual channel while the rest is accessed as a single.
Theoretical RAM peak rates:
1333mhz DDR x 8bytes x (2) Dual channel = 21.3gb/s
1333mhz DDR x 8bytes x (1.5) Flex Channel = 15.9gb/s
1333mhz DDR x 8bytes x (1) Single Channel = 10.6gb/s
Even on single channel it wont bottleneck transfer rates to the CPU. -
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i have 4 gigs of ram at 1333.i would like to increase it to 8 i just call dell and they well help me.i never owened a gaming pc before.i would like 8 gig's of ram if it well speed up fps without having to overclock anything.i am a noob i dont knoww the first thing about overclocking but i am digesting every tid bit of info.right now i am using fraps it is between 30 and 50. jumping back and forth.i would like to get it to a steady 45 to 55 is that even possible??
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You're just wasting money if you think upgrading to 8GB from 4GB will give you any sort of performance benefit in gaming. Bottom line: save your money and stick with 4GB.
6GB RAM ( 2 + 4 ) in my system, it means no dual channel mode?
Discussion in 'Alienware' started by Alienewbie, May 24, 2010.