I845D chipset

[ALstonLoong]

I was wonder will i get benefit from using ddr2700 instead of pc2100 ram in this chipset ? thanks

 

[oldfart]

Yes, depending on what mobo you have and if you overclock. The EPOX 4BDA board allows 3:4 mem timings @ any FSB. PC2700 (DDR 333) is a benefit. For instance:

P4 1.6A @ 133 FSB, 2.1GHz, 3:4 mem ratio = 355 DDR
P4 1.6A @ 144 FSB, 2.3 GHz, 3:4 mem ratio = 384 DDR
P4 1.6A @ 150 FSB, 2.4 GHz, 3:4 mem ratio = 400 DDR

You need good ram (Samsung PC2700 is good) to get these kinds of speeds. You also need a mobo that allows 3:4 mem ration @ any FSB.

 

[Mavrick007]

If you are overclocking your P4 cpu alot then it will help cause you will not be overclocking the memory as much (if over 166fsb), but other than that, the i845d does not have native support for more than pc2100 ram. If you don't plan on overclocking, then don't worry about it, just go with the pc2100(unless you can find the faster ram for a better price).

 

[ALstonLoong]

is that possible intel just limit the memory bandwidth to 2.1 G in i845D chipset ? so eventhough we are using pc 2700ddr , the actual memory bandwidth is still 2.1G ?

 

[AndyHui]

RAM bandwidth is entirely dependent at what speed you run the RAM at.

 

[ALstonLoong]

uh..ic ..thanks andy .. just confusing ..

 

[oldfart]

<< is that possible intel just limit the memory bandwidth to 2.1 G in i845D chipset ? so eventhough we are using pc 2700ddr , the actual memory bandwidth is still 2.1G ? >>


No. It all depends on if you are talking officially supported, unoffiical, overclocked.

Official, not overclocked is PC2100 DDR 266 (100FSB x 2DDR x 1.3333 mem ratio = DDR 266) or PC2100

Unofficial, overclock to 133 FSB: (133 x 2 1:1 mem ratio) = DDR266. OR (133 x 2 x 1.333 mem ratio) = DDR355 or ~ PC2850

Unofficial, overclock to 150 FSB: (150 x 2 1:1 mem ratio) = DDR300. OR (150 x 2 x 1.333 mem ratio) = DDR400 or ~ PC3200

Many 845 boards do not allow the 3:4 (1.333) mem ratio @ 133 and above FSB like the EPOX 4BDA and 4BDA2+ do. It works. I'm ruuning a P4 1.6A @ 2.4 GHz, 150 FSB, 400 MHZ DDR. Sandra mem score is ~ 3050.

 

[oldfart]

<<< Memory Bandwidth Benchmark >>>
------------------------------------------------------------------------------------------------

< Benchmark Results >
RAM Bandwidth Int Buffered iSSE2: 3037MB/s
RAM Bandwidth Float Buffered iSSE2: 3031MB/s

< Int Buffered iSSE2 (Integer STREAM) Results Breakdown >
Assignment: 3038MB/s
Scaling: 3038MB/s
Addition: 3037MB/s
Triad: 3036MB/s
Data Item Size: 4-bytes / 32-bits
Buffering Used: Yes
Bandwidth Efficiency: 95% (estimated)

< Float Buffered iSSE2 (Float STREAM) Results Breakdown >
Assignment: 3032MB/s
Scaling: 3033MB/s
Addition: 3029MB/s
Triad: 3031MB/s
Data Item Size: 8-bytes / 64-bits
Buffering Used: Yes
Bandwidth Efficiency: 95% (estimated)

< Test Statistics >
Array Memory Used: 256MB
SMP Test: No
Total Test Threads: 1
SMT Test: No
Dynamic MP/MT Load Balance: No
Processor Affinity: No

< System Chipset >
Model: Intel Corporation 82845 Brookdale CPU to I/O Bridge
Front Side Bus Speed: 4x 150MHz (600MHz data rate)
Max. Bus Bandwidth: 4800MB/s (estimated)

< Logical/Chipset Memory Banks >
Bank 0 Setting: 256MB ECC DDR-SDRAM
Bank 1 Setting: 256MB ECC DDR-SDRAM
Memory Bus Speed: 2x 200MHz (400MHz data rate)
Max. Memory Bandwidth: 3200MB/s (estimated)

< Instruction Set Support >
MMX Technology: Yes
SSE Technology: Yes
SSE2 Technology: Yes
Hyper-Threading Technology: No

< Performance Tips >
Notice N5008: To change benchmarks, click Options.
Notice N5004: Synthetic benchmark. May not tally with 'real-life'
performance.
Notice N5006: Only compare the results with ones obtained using the
same version!
Warning W5403: Tests using (E)MMX/SSE(2) are not standard STREAM.
Tip T2: For more information about tips, press F1 and scroll
to the Tips section.

------------------------------------------------------------------------------------------------
***** End of Report *****

 

[ALstonLoong]

oldfart thanks for the info .....
by the way, did you overclock your p4 to 150fsb by just using retail fan?
actually i am just planning to overclock to 133fsb, so i think crucial pc2100 ddr266 able to overclock to ddr333 right ?.... hopefully ..

 

[oldfart]

Yup. Retail HS/Fan with some ASIII, 1.675 Vcore. Crucial is good stuff. Should be fine. 133 FSB is an easy overclock for a 1.6A. If you get the Epox, you can do 133 FSB, 355 DDR (see my math lesson above) . If you get a mobo that does not have the 3:4 mem ratio @ 133 and above FSB, you will be @ 266 DDR.

 

[ALstonLoong]

Did you get the mobo from your nearby store ? or buy from other province ?

 

[oldfart]

Province? I actually got mine from Outpost.com. I'm not sure where is a good place for our brothers up North to get one.

 

[ALstonLoong]

wow..outpost.com seems like a good place to shop ! and they ship international !!! hehehe...thanks men