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 Post subject: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 12:14 pm 
8086
8086

Joined: Sun Jun 10, 2012 12:23 pm
Posts: 50
I have 16 GB of Corsair Vengeance 1600 Mhz RAM running alongside my new AMD 8350. No matter what I seem to do, the RAM always reports in CPU-Z's "SPD" tab as having a "max bandwidth" of only 667 Mhz. On the Memory page, CPU-Z reports that I'm running at 800 Mhz, which would be correct. At what speed is my RAM actually running?

I have a Gigabyte 990FXA-UD3 motherboard updated to the latest bios, though this problem occurred with a previous BIOS.

By using the "Profile 1" settings for my RAM in BIOS, which I'm assuming is the "off brand" representation of XMP (which these 4 sticks of Corsair RAM use), or by using Gigabyte's manual overclocking setup I can get the BIOS to claim that the RAM runs at 1600 Mhz. I even upped the voltage from 1.5 to 1.6 V to see if that had any effect (putting those gargantuan Corsair heat spreaders to use) and nothing seems to have come of it.

How fast is my RAM running, and if it isn't up to 1600 Mhz, how can I get it there?


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 Post subject: Re: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 12:44 pm 
Willamette
Willamette

Joined: Thu Aug 12, 2004 9:04 am
Posts: 1035
What processor do you have installed on this motherboard?


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 Post subject: Re: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 12:49 pm 
8086
8086

Joined: Sun Jun 10, 2012 12:23 pm
Posts: 50
An AMD FX 8350 "Piledriver" processor.


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 Post subject: Re: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 2:26 pm 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5256
RAM is double pumped. Your DDR3-1600's actual speed is 800MHz. 1600MHz is the rate it does a data transfer.


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 Post subject: Re: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 2:30 pm 
8086
8086

Joined: Sun Jun 10, 2012 12:23 pm
Posts: 50
I got the gist of the whole Double Data Rate thing, now I'm trying to get a handle on this SPD tab in CPU-Z where it tells me that I'm only running at 1333 Mhz, seemingly.

The memory tab also reported that my RAM was running at 800 Mhz when I was using it with a Phenom II 955 x4 processor, a processor that is limited to 1333 Mhz DDR3 memory.

CPU-Z is telling me the exact same stuff about my RAM that it was when I was using a processor less capable with DDR3 RAM. I'm finding this confusing..?


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 Post subject: Re: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 2:36 pm 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5256
Get a second opinion then, go run Speccy.


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 Post subject: Re: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 5:03 pm 
Willamette
Willamette

Joined: Thu Aug 12, 2004 9:04 am
Posts: 1035
So does your RAM occupy all of the available memory slots?


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 Post subject: Re: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 8:40 pm 
8086
8086

Joined: Sun Jun 10, 2012 12:23 pm
Posts: 50
Yes, all 4 slots are populated.

Speccy reports that my RAM is running at 800 Mhz with the rated 9-9-9-24 timings, furthering my curiosity about this "Max Bandwidth" stat in CPU-Z.


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 Post subject: Re: Unleashing my RAM
PostPosted: Tue Mar 26, 2013 8:45 pm 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5256
Digging around, SPD is just a method of verifying that the memory modules you bought are really the ones you bought. In any case, you can always push your RAM harder, like you can push your processor harder. It's just a matter of tweaking your BIOS settings until they don't like it.


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