28
M
M
X
X
4
4
6
6
U
U
2
2
-
-
G
G
N
N
/
/
M
M
X
X
4
4
6
6
-
-
5
5
3
3
3
3
G
G
N
N
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
D
D
D
D
R
R
2
2
6
6
6
6
(
(
P
P
C
C
2
2
1
1
0
0
0
0
)
)
a
a
n
n
d
d
D
D
D
D
R
R
3
3
3
3
3
3
(
(
P
P
C
C
2
2
7
7
0
0
0
0
)
)
DDR SDRAM utilizes the existing SDRAM infrastructure and technology while doubling the nominal bandwidth available to systems. To put
it in a simple way, DDR SDRAM is like data going along a two lane highway, while at the same time data in traditional SDRAM go along a
one way street. Therefore, it is a more advanced technology that provides a great overall improvement in system performance. DDR266
(PC2100) runs two times faster than the traditional PC133 SDRAM with the speed of Front Side Bus (FSB) up to 266MHz. (2x133=266).
And DDR333 (PC2700) is running at 333MHz FSB. Both PC2100 and PC2700 are a new naming standard for speed of DDR 266 and
DDR 333, representing their theoretical speeds of the RAM. The theoretical transfer rate of DDR 266 (PC2100) is 2.1GB/s and 2.7GB/s is
for DDR 333 (PC2700).
