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  DDR2-800 only running at 400 mhz 
 
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Bryson Jan 19, 2007, 01:18am EST Reply - Quote - Report Abuse
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I just got a new maching put together, I'm using an intel DG965WHMKR with mushkin DDR2-800 memory.

memory info:
http://www.mushkin.com/doc/products/memory_detail.asp?id=522

mobo info:
ftp://download.intel.com/design/motherbd/wh/D5600801US.pdf

CpuZ is telling me that the memory will top out at 400 mhz at 5-5-5-18. My bios recognizes it at 800 mhz at 5-5-5-18, but it is supposed to be timed at 5-5-5-12. I ran Memtest86+ 1.70 and everything checked out. I have the memory installed as dual channel (both blue slots). Is the memory bad or am i missing something? Any ideas?


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CrAsHnBuRnXp Jan 19, 2007, 01:35am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
Sometimes the BIOS will detect the wrong timings. My RAM is set for 2-3-2-5, but in the BIOS is shows up 2.5-3-2-5. So its nothing I would worry to much about. (IMO)

FordGT90Concept Jan 19, 2007, 01:44am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
400 MHz is the I/O clockspeed of DDR2-800 modules. The chips themselves are only running at 200 MHz. DDR2-800 has 800 MegaTransports per seconds and it's double the I/O clock because the memory reads and writes at the peaks of the wave. Yada yada, 400 MHz is correct.

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Shadow_Ops_Airman1 Jan 19, 2007, 01:51am EST Reply - Quote - Report Abuse
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Edited: Jan 19, 2007, 01:56am EST

 
>> Re: DDR2-800 only running at 400 mhz
certain programs recognize the real speed the ram is operating at, others detect the DDR rate. Going by the BIOS is the best bet for detection. but to let you in on something, PC6400 DDR2 Operates at a DDR2 Speed of 800 MHz, yet in the bios it can be detected as 100MHz/200 MHz/400MHz, it just depends on what motherboard you have.

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FordGT90Concept Jan 19, 2007, 03:38am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
Mind you, 800 MHz DDR2 sticks don't exist. Whenever you see 800 MHz, they mean 800 MT/s. The industry, for some reason, is quite confused on that matter. 800 MHz DDR2 sticks are aka DDR2-1600.

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Shadow_Ops_Airman1 Jan 19, 2007, 04:04am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
you got any info on that FordGT as it intrigues me. because in Theory PC 3200 DDR2 (3.2GB/s 400MHz [200MHz]) when in Dual Channel emulates PC 6400 DDR2 (6.4GB/s 800MHz [400Mhz]). Also another question, I know technically Intel's systems since the P4 were Quadpump architecture, does the A64 follow that same principle? Because i cant tell due to not owning an A64 system.

AMD Athlon XP-M 2500+ (133x14= 1867MHz) (209x11= 2299MHz)
DFI LP NF2 Ultra-B (Hellfire 3EG Rev2)
Antec SX800, Neo HE 500, 4 Antec 8CM Fans
Thermalright SI-97 1 Antec Tricool 12CM Fan
CL SB XFi Xtreme Music
2x Barracuda HDs (250/400)
2x Samsung Write
TamTheBam Jan 19, 2007, 04:29am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz

I'm not sure what Bryson's meaning here. I mean is thinking that both DIMMS should
be running at 800MHz or is he saying that it's 400MHz for each DIMM that he managed to
OC and he's realised that he can only go as high on each @ 400MHz so that
equals a total of 800MHz or is he asking if he can get 800MHz on each DIMM???

I'm confusiong myself here now lol!



....I'm back, but only as a part-timer... :)
FordGT90Concept Jan 19, 2007, 04:30am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
Yes, that is accurate because DDR2 has two I/O busses per stick when DDR has only one. It's kind of like dual channel without requiring two sticks. It grants extra bandwidth at little extra cost.

I'm not sure on your second question. Intel had to quad pump the internal bus because for sufficient bandwidth, they need to move data much faster than the FSB will allow. AMD doesn't have that issue because of HyperTransport and the on-die memory controller. I'm thinking its not.

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Bryson Jan 19, 2007, 11:37am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
I think someone answered my question. I am not trying to overclock my memory, I was just curious why CpuZ reported that my memory was capable of running at 266 and 400 mhz only. A lot has changed since the last computer I built, and I expected CpuZ to say that my memory was 800 mhz because DDR2-6400 = DDR2-800, correct? Thanks for the replies.

Bungle Jan 19, 2007, 12:56pm EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
Modern DDR and DDR2 (Double Data Rate) are improved versions of older SDRAM (Synchronous Dynamic Random Access Memory), the synchronous means that the memory’s data transfers are synchronized with the system using a clock cycle. If you were to graph the voltage of the clock signal wire against time you would see that it alternates between a high and low voltage at a regular interval with an almost instantaneous change between the two voltages. The transition point where the voltage goes from low to high is called the “rising edge” and the transition point between high and low is called the “falling edge”. SDRAM sent or received data on the rising edge of the memory clock, where DDR SDRAM sends or receives on the rising and falling edge... hence Double Data Rate. What this means is that DDR SDRAM has an effective clock speed that is 2x than that of SDRAM modules on the same clock signal.

So when the real memory clock is 400MHz the effective is 800MHz.

Sorry for being so technical but that is what is going on, your memory is working correctly.

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Bryson Jan 19, 2007, 01:17pm EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
I understand now, thanks for the info. :D

Chris M Jan 19, 2007, 02:14pm EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
On a different note, it aggravates me to no end that manufacturers mislabel products in order to confuse customers to inflate their sales. It's right up there with my hate of hard drive and media makers reporting capacity in base 10 instead of base 2.

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Bungle Jan 19, 2007, 02:20pm EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
Chris M said:
On a different note, it aggravates me to no end that manufacturers mislabel products in order to confuse customers to inflate their sales. It's right up there with my hate of hard drive and media makers reporting capacity in base 10 instead of base 2.


The RAM thing doesn't bother me so much, but on the Hard Drives I couldn't agree more. At the very least they should have to label them with a formatted capacity.

Core i7 4770K @ 4.4GHz | Corsair H110 | Gigabyte GA-Z87X-UD5H | 32GB 1866MHz Corsair Vengeance
2x EVGA GTX 780 SLI | 256GB OCZ Vector SSD | 4TB Hitachi 7K4000
Corsair AX1200 PSU | Corsair 650D | Windows 7 Ultimate x64
Shadow_Ops_Airman1 Jan 20, 2007, 08:08am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
proper terms would be this http://en.wikipedia.org/wiki/Gibibyte

Windows Measures in Binary where Manufactures measure in base 10. its a marketing scheme.

AMD Athlon XP-M 2500+ (133x14= 1867MHz) (209x11= 2299MHz)
DFI LP NF2 Ultra-B (Hellfire 3EG Rev2)
Antec SX800, Neo HE 500, 4 Antec 8CM Fans
Thermalright SI-97 1 Antec Tricool 12CM Fan
CL SB XFi Xtreme Music
2x Barracuda HDs (250/400)
2x Samsung Write
FordGT90Concept Jan 20, 2007, 10:07am EST Reply - Quote - Report Abuse
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>> Re: DDR2-800 only running at 400 mhz
Yup, the EIA needs to adopt the binary measurements as well so the industry as a whole properly labels things. Microsoft included. The bigger the volume gets on drives, the more you lose/gain when not properly labeled. For instance, for every Terabyte of capacity mislabeled, you lose or gain 99 GB worth of storage which is not an amount to be overlooked.

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If I remember what I forgot, I have not forgotten it.

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