|RAMCHECK LX Testers
RAMCHECK LX DDR2
RAMCHECK LX Base Tester
200-pin DDR2 SO-DIMM
200-pin DDR SO-DIMM
66-pin DDR Chip
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& SDRAM Test Results
- Q. What is SDRAM Technology? Can
RAMCHECK support SDRAM modules without an adapter?
A. Synchronous DRAM technology emerged in the mid nineties and provided a
revolutionary change in the way DRAM interfaced to a computer. It synchronizes
all the read/write transfers to a system clock, thus providing significantly
faster transfer rate for contiguous (same Row Address) group of data. A
Synchronous DRAM can burst up to a full columns length of continuous data at
the device clock rate (currently 150Mhz and higher rates). RAMCHECK has a
built-in 168-pin test socket and will support SDRAM modules without an adapter.
- Q. Can RAMCHECK support PC-133 (and higher
A. Yes. RAMCHECK's test engine can reach maximum internal frequency of 200MHz,
and can test SDRAM modules up to 166MHz. You will need to download the latest
firmware revisionand also to
review Application Note 13 that discusses
- Q. Can RAMCHECK support slower SDRAM
modules including the PC-100 or PC-66?
A. Yes. RAMCHECK has a much higher range than our previous SIMCHECK II
technology and it supports older SDRAM modules running at 66MHz or 100MHz, as
well as the state-of-the art faster modules.
- Q. Does RAMCHECK identify modules that
support the Athlon processor?
A. Yes, RAMCHECK identifies this module by displaying "SPD=CL2 at
100MHz" in the last summary screen as well as in the Test Log. .
- Q. How can I set stricter test
conditions when testing SDRAM on RAMCHECK?
A. You can elect to use the speed setup feature to set a specific frequency
rate for your tested module. This will insure a locked setting that will force
the module to work at only this speed. Please refer to your owner's manual
under Section 5.3.2 to review the information on TESTING DUT AT SETUP SPEED.
Alternatively, you may also use the Change-On-The-Fly feature (described in
Section 4 of your owner's manual) to set a one-time speed setting.
- Q. Can I use the RAMCHECK to program the
SPD codes of my SDRAM memory?
A. Yes. Advanced users, including memory manufacturers and memory repair
technician may use RAMCHECK's extensive support for editing and programming SPDs.
Regular users should not try to alter the SPD as it may crash the system if
wrong data is set.
- Q. The RAMCHECK shows the speed, Tac
access time, and Page Burst. Which is the most accurate parameter for
determining PC-100 compliance?
A. There are various parameters that are needed to qualify a module for PC-100
compliance. Currently all of these figures are taken into consideration before
RAMCHECK declares the module to be PC-100. You may review Application Note 13 for an explanation on how
RAMCHECK determines PC-100 compliance. Future firmware revisions may add some
additional parameters to this determination.
- Q. The SPD on the module tested says PC-66,
but the test log shows that it is PC-100 Range, will the module work as a
A. All of the parameters measured indicate the module to run at a PC-100 level,
and it may very well operate as PC-100, however, please remember that modules
react differently under different loads. Some modules when used in a complete
bank will slow down to the PC-66 level. Please review Application Notes
INN-8668-APN13 and INN-8668-APN3 to review what the individual
- Q. The SPD on the module says PC-100, but
the test log reports it to be PC-66, is the module PC-100?
A. Due to the possibility of loading, some modules may exhibit a slow down in
speed. We recommend checking the Tac access times for further reference on
PC-100 range. Also, refer to Application Notes INN-8668-APN13 and INN-8668-APN3 to review what the individual
- Q. What Tac range is appropriate for
A. Please refer to Application Note INN-8668-APN13 for an explanation of these
- Q. During the Extensive Test, the SDRAM
module under test now runs at 83MHz. Does this mean that it is not
A. The only test that determines PC-100 compliance is the BASIC Test, so we ask
that you check the results after BASIC Test. The frequencies used in the
Extensive Test are for other tests altogether. Please refer to Application note
INN-8668-APN13 for further information on
- Q. Why do some SDRAM modules test faster
than others even though they are the same size, and why does the PAGE BURST
(red) LED flash on some modules and not on others?
A. Some SDRAM modules employ a FULL PAGE BURST feature. SIMCHECK II takes
advantage of this feature found in some SDRAM components and uses it to test
the modules at a faster rate (shortening the overall test time). The Page Burst
LED (red) will flash vigorously throughout the test if the module employs this
feature. Please note, however, that a full page burst is not a requirement for
PC100 or PC133 compliance. Also, those modules having such a feature will not
have an advantage in systems over those not employing this Page Burst
have additional questions, please feel free to email us at
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