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Perf/Latency diff: TWIN2X1024-5400C4 vs Crucial Ballistix DDR2/PC2-5300


Hawkwind

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Givens:

- 1GB RAM total

- The TWIN2X1024-5400C4 uses SPD programmed and tested values of 4-4-4-12

- The Crucial Ballistix 512MB DDR2 PC2-5300 (BL6464AA664) uses SPD values set at timings of 5-5-5-12 for 664 speed but tested to 4-4-4-10 (will use 2 of these for 1GB total)

- The TWIN2X1024-5400C4 is less expensive than a pair of Crucial Ballistix 512MB (BL6464AA664)

- Motherboard: ASUS P5AD2 Premium using the latest BIOS and OC'ed as needed to get to the 5300/5400

- Top-end high-performance components such as: GeForce 6800 Ultra or ATI Radeon x800 XT, fastest SATA 10K RPM RAID-0 config disks, etc.

 

Performance questions: (no need to state numbers (unless you have them), just state at a high level which is faster and if a real world diff is seen)

1. 4-4-4-10 @ 5300/664-667 vs 4-4-4-12 @ 5400/675: What's the benchmark difference vs real world performance diff? (UT2004, Doom3, and other highend games)

2. Will the Crucial Ballistix (above) provide faster performance than TWIN2X1024-5400C4 using the tested 4-4-4-10?

3. Can the TWIN2X1024-5400C4 run stable using 4-4-4-10?

4. Will I be giving up anything for spending less on the TWIN2X1024-5400C4?

5. How will performance/timings (can still use 4-4-4-10/12??) be affected if using 2GB RAM total ie: two TWIN2X1024-5400C4 or four Crucial Ballistix? besides more RAM available :roll:

 

Thanks,

Hawkwind

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1. 4-4-4-10 @ 5300/664-667 vs 4-4-4-12 @ 5400/675: What's the benchmark difference vs real world performance diff? (UT2004, Doom3, and other highend games)

 

In benchmarks, 4-4-4-12 may actually be faster. Lower number on latencies aren't always the best thing, you have to understand what the numbers are and keeping the cycle open for those extra 2 clicks is probably a good thing.

 

It's like on AMD systems... 2-3-2-11 is faster than 2-3-2-6 by several megabytes per second!

 

In the real world, you probably won't be able to notice a difference.

 

 

2. Will the Crucial Ballistix (above) provide faster performance than TWIN2X1024-5400C4 using the tested 4-4-4-10?

 

Like I said, the benchmark numbers might be faster for 4-4-4-12, but you probably won't notice a difference.

 

 

3. Can the TWIN2X1024-5400C4 run stable using 4-4-4-10?

 

More than likely, but you wouldn't want to.

 

 

4. Will I be giving up anything for spending less on the TWIN2X1024-5400C4?

 

No, not at all. In fact, you'll be gaining a gaurantee! See, if the Crucial stuff is SPD rated to CAS 5, even if you TESTED it to run CAS 4, it's not gauranteed to do so. I.E. maybe not all of the modules will run it (in fact, I'm sure of this, otherwise they'd have rated them to CAS 4 in the first place).

 

 

5. How will performance/timings (can still use 4-4-4-10/12??) be affected if using 2GB RAM total ie: two TWIN2X1024-5400C4 or four Crucial Ballistix? besides more RAM available :roll:

 

You'll probably end up using CAS 5 or higher and will probably not be able to hit DDR675 with four modules like that.

 

Also, the Twin2X modules are tested and rated as a pair, not individual modules. Any time you buy an individual module, it is ONLY RATED AND GAURANTEED to run at it's timings by itself. Not as a pair and definately not in dual-channel.

 

 

PLUR

CK

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No, not at all. In fact, you'll be gaining a gaurantee! See, if the Crucial stuff is SPD rated to CAS 5, even if you TESTED it to run CAS 4, it's not gauranteed to do so. I.E. maybe not all of the modules will run it (in fact, I'm sure of this, otherwise they'd have rated them to CAS 4 in the first place).

CK

 

Not that it's any diff, but the "Tested 4-4-4-10" on the Crucial model was directly from their web site as they tested and state the speeds. (I have not tested any of this)

 

You'll probably end up using CAS 5 or higher and will probably not be able to hit DDR675 with four modules like that.

 

Also, the Twin2X modules are tested and rated as a pair, not individual modules. Any time you buy an individual module, it is ONLY RATED AND GAURANTEED to run at it's timings by itself. Not as a pair and definately not in dual-channel.

 

 

PLUR

CK

 

Does Corsair have either "tested pairs of twins" :biggrin: (quads) or 1GB modules in twin packs ie: whats the best way to get to 2GB total with top performance? (if not, when will they have 1GB modules in twin packs at these speeds)

 

Thanks

Hawkwind

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Corsair does not test "quads" of modules and probably won't start.

 

They do have 1Gb DDR-I modules, but I'm not aware of any 1Gb high-performance DDR-II modules as of yet.

 

The high-density IC's cost more and the 1Gb modules usually lag behind in production because of it. Since the DDR-II market is pretty new, I wouldn't count on seeing them for at least another quarter or more.

 

The best way to get top performance w/ 4 modules is to buy two matched sets and hope they're all the same revision (as close to matched w/ each other as possible). It also helps to buy very high quality modules because they tend to run a little better and you have the option of relaxing the latencies if you can't get it stable.

 

If you were dead-set on 4 modules, I'd go with two Twin2X1024-5400C4 sets.

 

PLUR

CK

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