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Several RAM and FSB Questions

F

February

#1
Hi every one, I have been wondering something, I have a motherboard with
1600 MHz FSB support. My current cpu is a 1333 MHz one, and my rams are
DDR-2 667, which means 1333 mhz. So my FSB:DRAM ratio is 1:1.

P.SO.: I do not over clock my system.

The questions I have are these:

Since my CPU is 1333, if I install DDR-2 800 rams, my ratio will be 5:4 or
something like that.

1. Will my rams slow down to the FSB of the CPU?

2. If yes, what is the point in installing faster rams if they are slowing
down to the FSB of the CPU?

3. If there is a benefit, what is it?

4. If rams are faster, do they somehow increase the performance of the
graphics cards? (For, both ATI and NVIDIA make use of the system ram Hyper
Memory and Turbo Cache)

5. Wouldn't it be effected by CPU's FSB? Lets say you have a DDR-4 graphics
card, and your rams are DDR-2 800, rams are slower than the card, and CPU is
slower than both of them.

If somebody can answer these I will appreciate a lot. I could not find any
satisfactory answers so far.

Thanks in advance.
 

My Computer

scrooge

Member
Vista Pro
Messages
271
#2

My Computer

System One

  • CPU
    Intel Core 2 Duo E8400 / 3.00
    Motherboard
    ASUS P5K-E/WIFI-AP LGA 775 Int
    Memory
    G.SKILL 4GB (2 x 2GB)
    Graphics Card(s)
    SAPPHIRE 100225L Radeon HD 387
    Hard Drives
    1 x 1tb western digital
    4 x 250 western digital
    2 x 160 western digital
    1 x 320 western digital
C

Colin Barnhorst

#3
Stay with 667. Too many users are reporting that their systems will not
boot when the mobo is fully populated with 800 ram. The issue most often
arises with mobos that use nVidia chipsets. Investigate via the forum for
your mobo on the manufacturer's website. A lot of these chipsets use a
memory controller that does 32bit DMA even when running an x64 OS and the
load on the memory controller seems to be too much.

"February" <fs@xxxxxx> wrote in message
news:051EB117-0341-441E-913B-D45EB7111E53@xxxxxx

> Hi every one, I have been wondering something, I have a motherboard with
> 1600 MHz FSB support. My current cpu is a 1333 MHz one, and my rams are
> DDR-2 667, which means 1333 mhz. So my FSB:DRAM ratio is 1:1.
>
> P.SO.: I do not over clock my system.
>
> The questions I have are these:
>
> Since my CPU is 1333, if I install DDR-2 800 rams, my ratio will be 5:4 or
> something like that.
>
> 1. Will my rams slow down to the FSB of the CPU?
>
> 2. If yes, what is the point in installing faster rams if they are slowing
> down to the FSB of the CPU?
>
> 3. If there is a benefit, what is it?
>
> 4. If rams are faster, do they somehow increase the performance of the
> graphics cards? (For, both ATI and NVIDIA make use of the system ram Hyper
> Memory and Turbo Cache)
>
> 5. Wouldn't it be effected by CPU's FSB? Lets say you have a DDR-4
> graphics
> card, and your rams are DDR-2 800, rams are slower than the card, and CPU
> is
> slower than both of them.
>
> If somebody can answer these I will appreciate a lot. I could not find any
> satisfactory answers so far.
>
> Thanks in advance.
>
 

My Computer

P

Paul Shapiro

#4
I have a 1333 MHz FSB cpu with 8GB of DDR2-800 ram. As Colin described, I
had some instability with the ram at 800 MHz, so I dropped the ram to 667MHz
in the bios. I did some very minor benchmarking under both conditions, and
memory throughput was not significantly impacted by lowering the ram speed.
I'm guessing the synchronized access compensated for the slower speed. I am
also not an overclocker, so I don't care about the last 1% of speed.
Stability is my prime concern.

If I was buying again, I might still buy 800 MHz ram because a) maybe it's
more stable with 4 dimms at 667 than memory only rated for 667, and b) if
you upgrade to a 1600 MHz FSB cpu, you might care more about running the ram
at 800. Pricing wasn't drastically different for 667 vs. 800.

"February" <fs@xxxxxx> wrote in message
news:051EB117-0341-441E-913B-D45EB7111E53@xxxxxx

> Hi every one, I have been wondering something, I have a motherboard with
> 1600 MHz FSB support. My current cpu is a 1333 MHz one, and my rams are
> DDR-2 667, which means 1333 mhz. So my FSB:DRAM ratio is 1:1.
>
> P.SO.: I do not over clock my system.
>
> The questions I have are these:
>
> Since my CPU is 1333, if I install DDR-2 800 rams, my ratio will be 5:4 or
> something like that.
>
> 1. Will my rams slow down to the FSB of the CPU?
>
> 2. If yes, what is the point in installing faster rams if they are slowing
> down to the FSB of the CPU?
>
> 3. If there is a benefit, what is it?
>
> 4. If rams are faster, do they somehow increase the performance of the
> graphics cards? (For, both ATI and NVIDIA make use of the system ram Hyper
> Memory and Turbo Cache)
>
> 5. Wouldn't it be effected by CPU's FSB? Lets say you have a DDR-4
> graphics
> card, and your rams are DDR-2 800, rams are slower than the card, and CPU
> is
> slower than both of them.
 

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radercad

New Member
Messages
2
#5
Once again the MHz speed numbers do not tell the truth. Try going for a ram with a slower clock speed (667 MHz) but with a lower Cas Latency: 3 or 4 which is a safer way of getting faster ram rather than overclocking. If your CPU can do 1333MHz on the front side bus it does not mean that the motherboard BIOS will support it. There is a Memory chip for 800MHz that has a Cas Latency of 3 so if your MB can support it it should smoke the faster memory. OCZ Titanium XTC 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) it is costly but if you want to go fast without overclocking while remaining stable this is the only way to go. Timings for this is 3-4-4-15
 

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