GSR05AR6- 4A3
Balance	$175,492,000.00	Delay	24
Coupon	4.556	Dated	9/1/2005
Settle	9/30/2005	First Payment	10/25/2005
Prepay	10 CPB	15 CPB	20 CPB	25 CPB	30 CPB	40 CPB	50 CPB
98-13	5.074	5.202	5.384	5.594	5.816	6.305	6.871	Yield
98-13	71	88	109	132	156	213	276	Spread
98-17	5.027	5.143	5.307	5.497	5.697	6.138	6.648	Yield
98-17	67	82	101	123	144	196	254	Spread
98-21	4.981	5.084	5.230	5.399	5.578	5.971	6.425	Yield
98-21	62	76	94	113	132	179	231	Spread
98-25	4.935	5.025	5.154	5.302	5.459	5.804	6.203	Yield
98-25	57	70	86	103	120	162	209	Spread
98-29	4.889	4.966	5.077	5.205	5.341	5.638	5.982	Yield
98-29	53	64	78	94	109	146	187	Spread
99-01	4.842	4.908	5.001	5.109	5.222	5.472	5.761	Yield
99-01	48	58	71	84	97	129	165	Spread
99-05	4.796	4.850	4.925	5.012	5.104	5.307	5.541	Yield
99-05	44	52	63	74	85	113	143	Spread
99-09	4.751	4.791	4.849	4.916	4.987	5.142	5.321	Yield
99-09	39	47	56	65	73	96	121	Spread
99-13	4.705	4.733	4.774	4.820	4.869	4.977	5.102	Yield
99-13	34	41	48	55	62	80	99	Spread
99-17	4.659	4.675	4.698	4.724	4.752	4.813	4.884	Yield
99-17	30	35	40	45	50	63	77	Spread
99-21	4.613	4.617	4.623	4.629	4.635	4.650	4.667	Yield
99-21	25	29	33	36	38	47	56	Spread
99-25	4.568	4.559	4.547	4.534	4.519	4.487	4.450	Yield
99-25	21	23	25	26	26	31	34	Spread
99-29	4.522	4.502	4.472	4.438	4.403	4.324	4.233	Yield
99-29	16	18	18	17	15	14	12	Spread
100-01	4.477	4.444	4.397	4.344	4.287	4.162	4.017	Yield
100-01	12	12	10	7	3	-2	-9	Spread
100-05	4.432	4.387	4.323	4.249	4.171	4.000	3.802	Yield
100-05	7	6	3	-2	-8	-18	-31	Spread
100-09	4.386	4.330	4.248	4.154	4.055	3.838	3.588	Yield
100-09	3	0	-5	-12	-20	-34	-52	Spread
100-13	4.341	4.272	4.174	4.060	3.940	3.677	3.374	Yield
100-13	-2	-5	-12	-21	-31	-50	-74	Spread
WAL	3.06	2.38	1.80	1.40	1.14	0.80	0.60
Principal Window	Oct05 - Jun10	Oct05 - May10	Oct05 - Dec09	Oct05 - Jan09	Oct05 - May08	Oct05 - Aug07	Oct05 - Feb07
CMT_1YR	3.8600
Swap curve
0.5YR	4.077
1YR	4.24625
2YR	4.306
3YR	4.359
4YR	4.402
5YR	4.449
6YR	4.497

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