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Author Topic: Kingston HyperX questions  (Read 2746 times)

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GrunbergTopic starter

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Kingston HyperX questions
« on: 17-January-04, 16:28:37 »

- 400W Antec PS
- MSI K8T Neo mobo, AMD Athlon 64 3200+ CPU
- VIDEO: ATI Radeon 9600XT (128MB, AGP)
- CURRENT MEMORY: 512+256MB DDR (PC-2100)

After much research on DDR memory, I may be pursuing two 512MB PC-3200 sticks of Kingston HyperX. PRICEWATCH.COM's most positively reviewed dealer for Hyper X was ZIPZOOMFLY.COM. This site offers two models of Kingston HyperX 1GB double-packs. One of them (KHX3200K2/1G) costs $280, and the other (KHX3200AK2/1G) costs $255 (note the A in the model number). The only differences I noticed between the kits are:

1) KHX3200K2 ($280) lists contents as "double-sided" memory. Suggested timings: 2-2-2-6-1 at latency 2.
2) KHX3200AK2 ($255) suggests timings of 2-3-2-6-1 at latency 2.

My questions are:

1) What difference does double-sided memory make? Can I use either kit with the above configuration?
2) What do the 5-digit timing values mean, and where in the BIOS do I adjust those in that order?
3) What adjustments, if any, would I make to FSB? Again, where in the BIOS?

Please pardon the lengthy post. There's simply not enough detailed product information. Any info is much appreciated! Thank you very much.

- Antec 400W PS
- MSI K8T Neo FIS2R (BIOS v1.9)
- AMD Athlon 64 3200+ CPU
- MONITOR: 19" Samsung 930B, 1280x1024 res
- HARD DRIVE (2): Maxtor 60GB 7200RPM Serial ATA
- CD DRIVE: Sony 52x32x52 DVD-ROM/CD-RW
- VIDEO: ATI Radeon 9600XT, 128MB AGP
- MEMORY: Corsair 1GB PC-3200 DDR
- OS: Windows XP Home SP2

- Dave


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« Reply #1 on: 17-January-04, 23:17:02 »

I'm fairly sure the KHX3200AK2 is the one that works right, the other one was mis-labeled or somthing of that nature.


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« Reply #2 on: 18-January-04, 10:28:26 »

Well Model# KHX3200K2/1G uses Winbond BH-5 chips which will run tighter timings of Cas2 2:2:6. Model# KHX3200AK2/1G utilizes chips other than BH-5 and cannot run these tight of timings. No longer in production, the Winbond BH-5 chips are some of the most sought after memory by performance enthusiasts.

I just got the KHX3200AK/1G seems to going smooth thus far.

Steve F.

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« Reply #3 on: 18-January-04, 15:16:09 »

Just a word of warning. I bought PC3200 HyperX since it's either that or Corsair here, the HyperX is cheaper, it's rated CAS 2.0 and I read a lot of good things about it (well, nothing bad).

Anyway, I've now found that it's SPD is CAS 2.0 only when run at 333 FSB. At 400 it's CAS 2.5. You won't find that on their web site. Sneaky.
MSI K8N Neo Platinum
Athlon 64 3400+ Clawhammer (stock heatsink/fan)
Enermax EG465AX-VE 431W PSU (squillions of amps on all rails)
2*512MB Kingston HyperX PC3500 (CL2.5)
MSI FX5700-TD128 (<--junk!) BFG 256MB FX5700 OC
2*WD Raptor 74GB SATA (RAID 0)
1*Maxtor DM Plus 9 80GB SATA
Plextor PX-712A DVD±R/RW
Win XP Pro SP2
Others: K8T Neo2-F + 3500 Venice, KT3 Ultra-ARU + XP 2500+


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« Reply #4 on: 18-January-04, 16:40:38 »

I have some KHX3500 rated as 2-2-2-6-1
I am curently runing them at 2-3-3-6 I think, is there any good soft to see the timings in win. some off the setings in bios are at auto.


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« Reply #5 on: 18-January-04, 16:52:15 »

Steve:  That's not necessarily true about the 333.  I have the HyperX 3200 running fine at CAS 2.0 @ 400 mHz.  My timings are 2-4-2-6-1 and so far I've had no problems at all.  I haven't yet tried 2-3-2-6-1 which is the specified rating, but one of the stickies at the top explains that I probably won't be able to get that with this memory.


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« Reply #6 on: 18-January-04, 18:42:45 »

Either the memory with 2-2-2-6-1T timings or 2-3-2-6-1T should work with the K8T Neo (although you will probably have to mess with timings with either one).  The faster memory (with BH-5 chips) should probably work, although I've found that some DIMMs which were produced in transition will not run reliably at DDR400 speeds.

No HyperX PC3200 sticks should have to be run at 333 in order to achieve CAS 2.0, although with this particular chipset, other adjustments will probably have to be made to the tRCD latency or voltage (read my post here for more details).

A good little utility that shows memory timings in Windows is called CPU-Z.  Apart from showing memory timings, it also shows many other specifications about your machine.

The numbers that Kingston refers to (2-3-2-6-1T, for example) are as follows.
1) The first number is the CAS latency.  It is the amount of clocks that the RAM must wait before the read command is processed for active data.  You probably do not want to slow down this timing to solve inconsistencies.
2) The second number is the RAS to CAS delay, or tRCD.  It is the number of clocks that it takes after a read signal is given before memory access is possible (the amount of time it takes to make memory "active").  It is the one of the numbers that is likely to improve inconsistencies with fast RAM on KT800 boards.
3) The third number refers to the RAS precharge delay, or tRP, which is the wait time to deactivate a row of memory.  I don't usually slow down this timing to solve memory inconsistencies.
4) The fourth number is the tRAS delay, which is the total minimum active-to-precharge delay.  This is another timing which may (when set higher) solve memory problems.
5) The "1T" refers to the Command Rate.  Most memory companies do not include it in the speed rating of their RAM.

So... move the tRCD first, tRAS second, and perhaps the tRP, followed by (if you want) the CAS latency.  Also, upping the DRAM voltage can often solve problems.  

More information about this is all over the forums.

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