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SuperPi 8M Results

Generally speaking, latencies between the two chipsets - P965 and P35 - are pretty similar.  at default FSBs of each respective processor. Twiddle a bit with higher FSBs, and we began to see some interesting twists.P35 seem to favor large cache processors, according to the results we saw with our Sciencemark Membench. Naturally we are intrigued - how does this peculiar behavior in other applications. We turned to SuperPi 8M for our second test.

Core 2 Duo E6300 & P965

	7x266 MHz SPD	7x333 MHz	6x400 MHz	7x400 MHz
Iterations	seconds	seconds	seconds	seconds
1	15	13	13	11
2	30	25	24	21
3	44	37	36	31
4	58	49	47	42
5	72	61	59	52
6	86	73	70	62
7	100	85	82	72
8	114	97	94	82
9	128	109	105	93
10	142	121	117	103
11	156	132	128	113
12	170	145	140	123
13	184	157	151	133
14	198	168	163	144
15	212	180	174	154
16	226	192	186	164
17	240	204	197	174
18	254	216	209	184
19	268	228	220	194
20	282	239	231	204
21	295	251	242	214
22	307	261	252	223

Core 2 Duo E6300 & P35 - DDR2

	7x266 MHz SPD	7x333 MHz	6x400 MHz	7x400 MHz
Iterations	seconds	seconds	seconds	seconds
1	16	13	13	11
2	30	25	25	21
3	44	37	36	31
4	58	49	47	41
5	72	61	59	51
6	86	72	70	61
7	100	84	81	72
8	114	96	93	82
9	129	108	104	92
10	143	120	116	102
11	157	132	127	112
12	171	143	138	122
13	185	155	149	132
14	199	167	161	142
15	213	179	172	152
16	227	191	183	163
17	241	202	195	173
18	255	214	209	183
19	269	226	217	193
20	283	237	228	202
21	296	248	239	212
22	308	259	249	221

Core 2 Duo E6300 & P35 - DDR3

	7x266 MHz SPD	7x333 MHz	6x400 MHz	7x400 MHz
Iterations	seconds	seconds	seconds	seconds
1	15	13	13	11
2	30	25	24	21
3	44	37	35	31
4	58	49	47	42
5	72	61	59	52
6	86	72	70	62
7	100	84	81	72
8	114	96	93	83
9	128	108	104	93
10	142	120	116	103
11	156	132	127	113
12	170	144	139	123
13	184	155	150	134
14	199	167	162	144
15	213	179	173	154
16	227	191	184	164
17	241	203	196	174
18	255	214	207	184
19	268	226	219	194
20	282	238	230	204
21	295	249	240	214
22	308	259	250	223

The difference is small, but its there even at default clocks. As we increase FSB and clock, the difference increased from 1 to 2 / 3 seconds. Much like we saw with Sciencemark Membench, we did not see much of a difference between P965 and P35 with the Core 2 Duo E6300. Now, let's see how does the same test do fare with E6550.

Core 2 Duo E6550 & P965

	7x333 MHz	6x400 MHz	7x400 MHz
Iterations	seconds	seconds	seconds
1	13	13	11
2	25	24	21
3	37	36	31
4	48	47	41
5	60	58	51
6	72	70	61
7	83	81	71
8	95	93	81
9	107	104	91
10	119	115	101
11	130	127	111
12	142	138	121
13	154	149	131
14	165	161	141
15	177	174	151
16	189	183	161
17	200	195	171
18	212	206	181
19	223	217	191
20	235	228	201
21	246	239	210
22	266	249	219

Core 2 Duo E6550 & P35 - DDR2

	7x333 MHz	6x400 MHz	7x400 MHz
Iterations	seconds	seconds	seconds
1	13	12	11
2	24	23	21
3	36	35	31
4	47	46	41
5	59	57	51
6	71	68	61
7	82	79	72
8	94	91	82
9	105	102	92
10	117	113	102
11	129	124	112
12	140	138	122
13	152	147	132
14	164	158	142
15	175	169	152
16	187	180	163
17	198	191	173
18	210	202	183
19	221	213	193
20	233	224	202
21	244	235	212
22	254	245	221

Core 2 Duo E6550 & P35 - DDR3

	7x333 MHz	6x400 MHz	7x400 MHz
Iterations	seconds	seconds	seconds
1	13	12	11
2	24	24	21
3	36	35	31
4	48	47	42
5	59	59	52
6	71	69	62
7	83	81	72
8	94	92	83
9	106	103	93
10	118	115	103
11	129	126	113
12	141	138	123
13	153	149	134
14	164	160	144
15	176	172	154
16	188	183	164
17	199	194	174
18	211	205	184
19	222	217	194
20	234	228	204
21	245	238	214
22	255	248	223

Needless to say, the results here are pretty interesting. Look at the difference at E6550 default FSB between the P965 and P35 - thats 11 to 12 seconds, definitely far bigger than the 2 second difference we saw between both chipsets with E6300 on the same speed (7x333 MHz). The lack of asynchronous memory setting support for 1333 MHz FSB processor on the P965 really hurt its performance. At 333 MHz the difference is smaller - only about 4 seconds. At 400 MHz FSB, we saw the difference between P965 and P35 dwindle to 2 seconds. At this speed, the E6300 at 2.8 GHz is actually neck to neck with the E6550 at the same clock - if you're using a P35 equipped motherboard with DDR2 and DDR3. The fastest combination? The E6550 with P965 - 2 seconds faster at 219 seconds.

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