DDR3 Memory Round-Up: Corsair, Kingston, OCZ, Super Talent

Name: DDR3 Memory Round-Up: Corsair, Kingston, OCZ, Super Talent - Page 4
Brand: DDR3

by Marco Chiappetta — Friday, September 14, 2007, 04:30 AM EDT

Kingston KHX11000D3ULK2/2G

At first glance, the Kingston KHX11000D3ULK2/2G memory kit looks just like the KHX11000D3LLK2/2G shown on the previous page, save for the different decals affixed to its heatspreaders with the kits model number and specifications. But the KHX11000D3ULK2/2G is actually quite different, at least from a performance standpoint.

Kingston KHX11000D3ULK2/2G

Specifications and Features

"Kingston's KHX11000D3ULK2/2G is a kit of two 128M x 64-bit 1GB (1024MB) DDR3-1375 CL5 SDRAM (Synchronous DRAM) "ultra low latency" memory modules, based on sixteen 64M x 8-bit DDR3 FBGA components per module. Each module pair has been tested to run at DDR3-1375MHz at a low latency timing of 5-7-5 at 1.8V. The SPDs are programmed to JEDEC standard latency DDR3-1333Mhz timing of 8-8-8 at 1.5V. Each 240-pin DIMM uses gold contact fingers and requires +1.5V. The JEDEC standard electrical and mechanical specifications are as follows:"

Features:

JEDEC standard 1.5V ± 0.075V Power Supply
VDDQ = 1.5V ± 0.075V
667MHz fCK for 1333Mb/sec/pin
8 independent internal bank
Programmable CAS Latency: 5,6,7,8,9,10
Posted CAS
Programmable Additive Latency: 0, CL - 2, or CL - 1 clock
Programmable CAS Write Latency(CWL) = 8(DDR3-1333)
8-bit pre-fetch
Burst Length: 8 (Interleave without any limit, sequential with starting address “000” only), 4 with tCCD = 4 which does not allow seamless read or write [either on the fly using A12 or MRS]
Bi-directional Differential Data Strobe
Internal(self) calibration : Internal self calibration through ZQ pin (RZQ : 240 ohm ± 1%)
On Die Termination using ODT pin

Features (Cont.):

Average Refresh Period 7.8us at lower then TCASE 85°C, 3.9us at 85°C < TCASE . 95°C
Asynchronous Reset
1333Mbps CL8 doesn’t have backward compatibility with 800Mbps CL5
PCB : Height 1.180” (30.00mm), double sided component

Performance:

CL(IDD) = 8 cycles
Row Cycle Time (tRCmin) = 48ns (min.)
Refresh to Active/Refresh Command Time (tRFCmin) = 90ns
Row Active Time (tRASmin) = 36ns (min.)
Power = TBD W (operating per module)
UL Rating = 94 V - 0
Operating Temperature = 0oC to 85oC
Storage Temperature = -55oC to +100oC

Kingston's KHX11000D3ULK2/2G Low Latency DDR3 Kit

Like the KHX11000D3LLK2/2G memory kit we showed you earlier, Kingston's KHX11000D3ULK2/2G kit is rated for operation at PC3-11000, or DDR3-1333 speeds. This memory kit also features the same basic, blue aluminum heatspreaders and is comprised of a matched pair of 1GB DIMMs. The Kingston KHX11000D3ULK2/2G kit, however, features much lower supported timings of 5-7-5-15 at 1.8v (as opposed to 7-7-7 on the KHX11000D3LLK2/2G kit). As we mentioned in our introduction a few pages back, one of the major complaints voiced regarding early DDR3 memory samples was their relatively high latencies. As CAS 5 at 1333MHz though, Kingston's kit features some of the lowest latencies of any high-speed DDR3 memory kit.