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Speccy reports 800 on a dual channel 1600 and 400 on a dual channel 800. Thats because there is 400 to each channel for 800mghz, and aprox. 800 per channnel for 1600mghz. That particular specification is per channel. Read the link above to see how Double data rate works.

Hello~ I may have a similar problem but not really sure. I just purchased pc2-4200 (533) and speccy is reporting it as being pc2-6400 (800). Generated by Piriform Speccy v1.07.205 31 Dec 2010 @ 14:41Summary Operating System MS Windows Vista Home Premium 32-bit SP2 CPU Intel Core Duo T2250 @ 1.73GHz Yonah 65nm Technology Intel Core Duo T2250 Cores:2 Threads:2 Name:Intel Core Duo T2250 Code Name:Yonah Package:Socket 479 mPGA Technology:65nm Specification:Genuine Intel(R) CPU T2250 @ 1.73GHz Family:6 Extended Family:6 Model:E Extended Model:E Stepping:8 Revision:C0 Instructions:MMX, SSE, SSE2, SSE3 Bus Speed:133.0 MHz Rated Bus Speed:532.1 MHz Stock Core Speed:1733 MHz Stock Bus Speed:133 MHz Average Temperature:94 ?F Caches L1 Data Cache Size:2 x 32 KBytes L1 Instructions Cache Size:2 x 32 KBytes L2 Unified Cache Size:2048 KBytes Core 0 Core Speed:1729.0MHz Multiplier: x 13.0 Bus Speed:133.0 MHz Rated Bus Speed:532.1 MHz Temperature:94 ?F Thread 1 APIC ID: 0 Core 1 Core Speed:1729.0 MHz Multiplier: x 13.0 Bus Speed:133.0 MHz Rated Bus Speed:532.1 MHz Temperature:94 ?F Thread 1 APIC ID: 1 RAM 3.0GB Dual-Channel DDR2 @ 266 MHz (4-4-4-12) RAM Memory slots Total memory slots:2 Used memory slots:2 Free memory slots:0 Memory Type:DDR2 Size:3072 MBytes Channels #:Dual DRAM Frequency:266.1 MHz CAS# Latency (CL):4 clocks RAS# to CAS# Delay (tRCD):4 clocks RAS# Precharge (tRP):4 clocks Cycle Time (tRAS):12 clocks Bank Cycle Time (tRC):16 clocks SPD Number Of SPD Modules:2 Slot #1 Type:DDR2 Size:2048 MBytes Manufacturer:ElpidaMax Bandwidth:PC2-6400(400 MHz) Part Number:EBE21UE8AFSA-8G-F Serial Number:5AF61A02 Week/year: 10 / 10 SPD Ext.:EPP JEDEC #3 Frequency:400.0 MHz CAS# Latency:6.0 RAS# To CAS#:6 RAS# Precharge:6 tRAS:18 tRC:24 Voltage:1.800V JEDEC #2 Frequency:333.3 MHz CAS# Latency:5.0 RAS# To CAS#:6 RAS# Precharge:6 tRAS:16 tRC:21 Voltage:1.800V JEDEC #1 Frequency:266.7 MHz CAS# Latency:4.0 RAS# To CAS#:4 RAS# Precharge:4 tRAS:12 tRC:16 Voltage:1.800V Slot #2 Type:DDR2 Size:1024 MBytes Manufacturer:Samsung Max Bandwidth:PC2-4300(266 MHz) Part Number:M4 70T2953CZ3-CD5 Serial Number:F5232680 Week/year: 21 / 06 SPD Ext.:EPP JEDEC #3 Frequency:266.7 MHz CAS# Latency:5.0 RAS# To CAS#:4 RAS# Precharge:4 tRAS:11 tRC:15 Voltage:1.800V JEDEC #2 Frequency:266.7 MHz CAS# Latency:4.0 RAS# To CAS#:4 RAS# Precharge:4 tRAS:11 tRC:15 Voltage:1.800V JEDEC #1 Frequency:200.0 MHz CAS# Latency:3.0 RAS# To CAS#:3 RAS# Precharge:3 tRAS:8 tRC:11 Voltage:1.800V Still, I think in slot#2 speccy reported it as pc2-4300 when I believe the sticker on the ram chip read pc2-4200. The pc2-6400 reported by speccy may or may not be pc2-6400. I just bought this and maybe they tagged it wrong@pc2-4200 at the factory. PP