Articles: Memory
 

Bookmark and Share

(14) 
Pages: [ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 ]

We also had this processor working with 275MHz FSB, that is, at 3.3GHz clock-rate. Currently available memory modules do not support such FSB frequency in the synchronous mode, so we had only two options: 220MHz (440MHz DDR) and 168MHz (336MHz DDR). For each test, we picked up memory modules that would work with minimal possible timings for the given frequency. Thus, we tested DDR500 with 2.5-4-4-5 timings (DDR500 modules from GeIL, OCZ or Corsair may do), while DDR400 was used with 2-3-3-6 timings. In all other cases, we chose the most aggressive timing scheme: 2-2-2-5.

For a better comparison, we also showed the results of “true” (non-overclocked) Pentium 4 3.2 and 3.0GHz processors with the best DDR400 memory.

Following our good tradition, synthetic tests come first. The table below lists the results we got when measuring the memory subsystem performance in Cachemem.

 

Pentium 4 3.0 (FSB 1000MHz)
DDR333 | 2-2-2-5

Pentium 4 3.0 (FSB 800MHz)
DDR400 | 2-2-2-5

Pentium 4 3.3 (FSB 1100MHz)
DDR336 | 2-2-2-5

Pentium 4 3.0 (FSB 1000MHz)
DDR400 | 2-2-2-5

Pentium 4 3.3 (FSB 1100MHz)
DDR440 | 2-3-3-6

Pentium 4 3.0 (FSB 1000MHz)
DDR500 | 2.5-4-4-5

Memory read speed, MB/s

3232.8

3560.7

3567.7

3110.4

3694.8

4128.5

Memory write speed, MB/s

1278.2

1597.1

1330.2

1347.1

1580.9

1331.6

Memory copy speed, MB/s

2260.1

2931

2603.4

2773.8

2729.3

2793

Latency

290

226

283

250

267

200

You see that DDR500 SDRAM working synchronously with the 250MHz FSB is not unrivaled even in the synthetic tests. Although this combination works quite well, far not the best memory timings spoil the results in the data write and copy tests. The combination of DDR400 SDRAM with 2-2-2-5 timings and 200MHz FSB is good enough too and sometimes proves even better than DDR500. As for other competing solutions, they cannot perform as fast as DDR400 SDRAM with aggressive timings. We are going to see a little later how this affects the system performance in real applications. For now, let us run a few more synthetic benchmarks.

The performance in Sandra benchmark first of all depends on the bandwidth of the CPU-memory bus. That is why no wonder that Pentium 4 2.4C overclocked to 3GHz and supported by DDR500 memory did much better that the others. DDR400 takes the second place.

The memory subsystem test from PCMark2002 produces a slightly different picture: DDR400 SDRAM working in synchronous mode with the FSB yields better results than DDR440 working at 5:4 of the FSB frequency.

 
Pages: [ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 ]

Discussion

Comments currently: 14
Discussion started: 09/15/03 12:43:47 PM
Latest comment: 08/25/06 11:53:51 AM

View comments

Add your Comment